646523080 has 32 divisors (see below), whose sum is σ = 1662488640. Its totient is φ = 221664960.

The previous prime is 646523063. The next prime is 646523081. The reversal of 646523080 is 80325646.

It is a happy number.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (646523081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154226 + ... + 1154785.

It is an arithmetic number, because the mean of its divisors is an integer number (51952770).

Almost surely, 2^646523080 is an apocalyptic number.

It is an amenable number.

646523080 is an abundant number, since it is smaller than the sum of its proper divisors (1015965560).

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

646523080 is a wasteful number, since it uses less digits than its factorization.

646523080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2309029 (or 2309025 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 646523080 is about 25426.8181257506. The cubic root of 646523080 is about 864.6918077449.

The spelling of 646523080 in words is "six hundred forty-six million, five hundred twenty-three thousand, eighty".