646520832 has 224 divisors, whose sum is σ = 1992172800. Its totient is φ = 207028224.

The previous prime is 646520807. The next prime is 646520839. The reversal of 646520832 is 238025646.

646520832 is a `hidden beast` number, since 646 + 5 + 2 + 0 + 8 + 3 + 2 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (646520839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8183769 + ... + 8183847.

Almost surely, 2^646520832 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 646520832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (996086400).

646520832 is an abundant number, since it is smaller than the sum of its proper divisors (1345651968).

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

646520832 is an equidigital number, since it uses as much as digits as its factorization.

646520832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 121 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 646520832 is about 25426.7739204170. The cubic root of 646520832 is about 864.6908055484.

The spelling of 646520832 in words is "six hundred forty-six million, five hundred twenty thousand, eight hundred thirty-two".