620607744 has 135 divisors (see below), whose sum is σ = 1861298593. Its totient is φ = 205673472.

The previous prime is 620607739. The next prime is 620607749. The reversal of 620607744 is 447706026.

The square root of 620607744 is 24912.

It is a perfect power (a square), and thus also a powerful number.

620607744 is a `hidden beast` number, since 6 + 2 + 0 + 607 + 7 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (620607739) and next prime (620607749).

It can be written as a sum of positive squares in only one way, i.e., 564537600 + 56070144 = 23760^2 + 7488^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a Duffinian number.

It is a zygodrome in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 620607699 and 620607708.

It is not an unprimeable number, because it can be changed into a prime (620607749) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 3587242 + ... + 3587414.

Almost surely, 2^620607744 is an apocalyptic number.

620607744 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

620607744 is the 24912-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620607744

620607744 is an abundant number, since it is smaller than the sum of its proper divisors (1240690849).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

620607744 is an frugal number, since it uses more digits than its factorization.

620607744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The cubic root of 620607744 is about 852.9804226442.

Multiplying 620607744 by its sum of digits (36), we get a square (22341878784 = 149472²).

620607744 divided by its sum of digits (36) gives a square (17239104 = 4152²).

The spelling of 620607744 in words is "six hundred twenty million, six hundred seven thousand, seven hundred forty-four".