646074756 has 36 divisors (see below), whose sum is σ = 1633927932. Its totient is φ = 215253504.

The previous prime is 646074743. The next prime is 646074799. The reversal of 646074756 is 657470646.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 326380356 + 319694400 = 18066^2 + 17880^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116560 + ... + 121976.

It is an arithmetic number, because the mean of its divisors is an integer number (45386887).

Almost surely, 2^646074756 is an apocalyptic number.

It is an amenable number.

646074756 is an abundant number, since it is smaller than the sum of its proper divisors (987853176).

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

646074756 is a wasteful number, since it uses less digits than its factorization.

646074756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8740 (or 8735 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The square root of 646074756 is about 25418.0006294752. Note that the first 3 decimals coincide. The cubic root of 646074756 is about 864.4918913288.

The spelling of 646074756 in words is "six hundred forty-six million, seventy-four thousand, seven hundred fifty-six".