646413025 has 12 divisors (see below), whose sum is σ = 802704700. Its totient is φ = 516386880.

The previous prime is 646412993. The next prime is 646413067. The reversal of 646413025 is 520314646.

It can be written as a sum of positive squares in 6 ways, for example, as 111323601 + 535089424 = 10551^2 + 23132^2 .

It is not a de Polignac number, because 646413025 - 2⁵ = 646412993 is a prime.

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, 510 + ... + 35959.

Almost surely, 2^646413025 is an apocalyptic number.

It is an amenable number.

646413025 is a deficient number, since it is larger than the sum of its proper divisors (156291675).

646413025 is a wasteful number, since it uses less digits than its factorization.

646413025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37188 (or 37183 counting only the distinct ones).

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

The square root of 646413025 is about 25424.6538816166. The cubic root of 646413025 is about 864.6427406349.

The spelling of 646413025 in words is "six hundred forty-six million, four hundred thirteen thousand, twenty-five".