620336640 has 320 divisors, whose sum is σ = 2474841600. Its totient is φ = 128778240.

The previous prime is 620336621. The next prime is 620336659. The reversal of 620336640 is 46633026.

It is an interprime number because it is at equal distance from previous prime (620336621) and next prime (620336659).

It is a tau number, because it is divible by the number of its divisors (320).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 620336598 and 620336607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 590836 + ... + 591884.

It is an arithmetic number, because the mean of its divisors is an integer number (7733880).

Almost surely, 2^620336640 is an apocalyptic number.

620336640 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 620336640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1237420800).

620336640 is an abundant number, since it is smaller than the sum of its proper divisors (1854504960).

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

620336640 is a wasteful number, since it uses less digits than its factorization.

620336640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 620336640 is about 24906.5581724975. The cubic root of 620336640 is about 852.8562002793.

Adding to 620336640 its reverse (46633026), we get a palindrome (666969666).

The spelling of 620336640 in words is "six hundred twenty million, three hundred thirty-six thousand, six hundred forty".