645390696 has 16 divisors (see below), whose sum is σ = 1613476800. Its totient is φ = 215130224.

The previous prime is 645390673. The next prime is 645390701. The reversal of 645390696 is 696093546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13445616 + ... + 13445663.

It is an arithmetic number, because the mean of its divisors is an integer number (100842300).

Almost surely, 2^645390696 is an apocalyptic number.

It is an amenable number.

645390696 is an abundant number, since it is smaller than the sum of its proper divisors (968086104).

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

645390696 is a wasteful number, since it uses less digits than its factorization.

645390696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26891288 (or 26891284 counting only the distinct ones).

The product of its (nonzero) digits is 1049760, while the sum is 48.

The square root of 645390696 is about 25404.5408539497. The cubic root of 645390696 is about 864.1866773416.

The spelling of 645390696 in words is "six hundred forty-five million, three hundred ninety thousand, six hundred ninety-six".