620641764 has 120 divisors (see below), whose sum is σ = 1750240800. Its totient is φ = 191134080.

The previous prime is 620641751. The next prime is 620641807. The reversal of 620641764 is 467146026.

620641764 is a `hidden beast` number, since 6 + 2 + 0 + 641 + 7 + 6 + 4 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 251167 + ... + 253625.

It is an arithmetic number, because the mean of its divisors is an integer number (14585340).

Almost surely, 2^620641764 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620641764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (875120400).

620641764 is an abundant number, since it is smaller than the sum of its proper divisors (1129599036).

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

620641764 is a wasteful number, since it uses less digits than its factorization.

620641764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2535 (or 2524 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 620641764 is about 24912.6827941111. The cubic root of 620641764 is about 852.9960083686.

The spelling of 620641764 in words is "six hundred twenty million, six hundred forty-one thousand, seven hundred sixty-four".