645738696 has 32 divisors (see below), whose sum is σ = 1793719200. Its totient is φ = 215246160.

The previous prime is 645738673. The next prime is 645738707. The reversal of 645738696 is 696837546.

645738696 is a `hidden beast` number, since 6 + 4 + 573 + 8 + 69 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1494550 + ... + 1494981.

It is an arithmetic number, because the mean of its divisors is an integer number (56053725).

Almost surely, 2^645738696 is an apocalyptic number.

It is an amenable number.

645738696 is an abundant number, since it is smaller than the sum of its proper divisors (1147980504).

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

645738696 is a wasteful number, since it uses less digits than its factorization.

645738696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2989546 (or 2989536 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 54.

The square root of 645738696 is about 25411.3891001653. The cubic root of 645738696 is about 864.3419749665.

The spelling of 645738696 in words is "six hundred forty-five million, seven hundred thirty-eight thousand, six hundred ninety-six".