645087210 has 32 divisors (see below), whose sum is σ = 1615524480. Its totient is φ = 164543808.

The previous prime is 645087197. The next prime is 645087211. The reversal of 645087210 is 12780546.

It is a super-2 number, since 2×645087210² = 832275017011168200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (645087211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 466765 + ... + 468144.

It is an arithmetic number, because the mean of its divisors is an integer number (50485140).

Almost surely, 2^645087210 is an apocalyptic number.

645087210 is an abundant number, since it is smaller than the sum of its proper divisors (970437270).

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

645087210 is a wasteful number, since it uses less digits than its factorization.

645087210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934942.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 645087210 is about 25398.5670855661. The cubic root of 645087210 is about 864.0511988479.

The spelling of 645087210 in words is "six hundred forty-five million, eighty-seven thousand, two hundred ten".