646315402 has 16 divisors (see below), whose sum is σ = 1007303400. Its totient is φ = 310645440.

The previous prime is 646315393. The next prime is 646315403. The reversal of 646315402 is 204513646.

It can be written as a sum of positive squares in 4 ways, for example, as 614494521 + 31820881 = 24789^2 + 5641^2 .

It is not an unprimeable number, because it can be changed into a prime (646315403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11049 + ... + 37612.

Almost surely, 2^646315402 is an apocalyptic number.

646315402 is a deficient number, since it is larger than the sum of its proper divisors (360987998).

646315402 is a wasteful number, since it uses less digits than its factorization.

646315402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48921.

The product of its (nonzero) digits is 17280, while the sum is 31.

The square root of 646315402 is about 25422.7339599816. The cubic root of 646315402 is about 864.5992115678.

The spelling of 646315402 in words is "six hundred forty-six million, three hundred fifteen thousand, four hundred two".