646492320 has 192 divisors, whose sum is σ = 2396096640. Its totient is φ = 162238464.

The previous prime is 646492291. The next prime is 646492333. The reversal of 646492320 is 23294646.

646492320 is a `hidden beast` number, since 6 + 4 + 649 + 2 + 3 + 2 + 0 = 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 31 ways as a sum of consecutive naturals, for example, 69039 + ... + 77841.

It is an arithmetic number, because the mean of its divisors is an integer number (12479670).

Almost surely, 2^646492320 is an apocalyptic number.

646492320 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 646492320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1198048320).

646492320 is an abundant number, since it is smaller than the sum of its proper divisors (1749604320).

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

646492320 is a wasteful number, since it uses less digits than its factorization.

646492320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8844 (or 8830 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 646492320 is about 25426.2132453891. The cubic root of 646492320 is about 864.6780942144.

The spelling of 646492320 in words is "six hundred forty-six million, four hundred ninety-two thousand, three hundred twenty".