645125610 has 32 divisors (see below), whose sum is σ = 1549593792. Its totient is φ = 171889920.

The previous prime is 645125609. The next prime is 645125617. The reversal of 645125610 is 16521546.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (645125617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30402 + ... + 47058.

It is an arithmetic number, because the mean of its divisors is an integer number (48424806).

Almost surely, 2^645125610 is an apocalyptic number.

645125610 is an abundant number, since it is smaller than the sum of its proper divisors (904468182).

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

645125610 is a wasteful number, since it uses less digits than its factorization.

645125610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17958.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 645125610 is about 25399.3230224744. The cubic root of 645125610 is about 864.0683432521.

The spelling of 645125610 in words is "six hundred forty-five million, one hundred twenty-five thousand, six hundred ten".