645081710 has 64 divisors (see below), whose sum is σ = 1452657024. Its totient is φ = 200793600.

The previous prime is 645081691. The next prime is 645081761. The reversal of 645081710 is 17180546.

It is a happy number.

It is a super-2 number, since 2×645081710² = 832260825153048200, which contains 22 as substring.

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, 49700 + ... + 61320.

It is an arithmetic number, because the mean of its divisors is an integer number (22697766).

Almost surely, 2^645081710 is an apocalyptic number.

645081710 is an abundant number, since it is smaller than the sum of its proper divisors (807575314).

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

645081710 is a wasteful number, since it uses less digits than its factorization.

645081710 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11709.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 645081710 is about 25398.4588115106. The cubic root of 645081710 is about 864.0487432134.

The spelling of 645081710 in words is "six hundred forty-five million, eighty-one thousand, seven hundred ten".