646974768 has 40 divisors (see below), whose sum is σ = 1823294016. Its totient is φ = 196052800.

The previous prime is 646974739. The next prime is 646974781. The reversal of 646974768 is 867479646.

It is a happy number.

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, 612138 + ... + 613193.

Almost surely, 2^646974768 is an apocalyptic number.

It is an amenable number.

646974768 is an abundant number, since it is smaller than the sum of its proper divisors (1176319248).

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

646974768 is a wasteful number, since it uses less digits than its factorization.

646974768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225353 (or 1225347 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 57.

The square root of 646974768 is about 25435.6986929787. The cubic root of 646974768 is about 864.8931307934.

The spelling of 646974768 in words is "six hundred forty-six million, nine hundred seventy-four thousand, seven hundred sixty-eight".