646253244 has 72 divisors (see below), whose sum is σ = 2010575840. Its totient is φ = 170439552.

The previous prime is 646253239. The next prime is 646253263. The reversal of 646253244 is 442352646.

646253244 is a `hidden beast` number, since 6 + 4 + 625 + 3 + 24 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 646253199 and 646253208.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95359 + ... + 101910.

Almost surely, 2^646253244 is an apocalyptic number.

It is an amenable number.

646253244 is an abundant number, since it is smaller than the sum of its proper divisors (1364322596).

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

646253244 is a wasteful number, since it uses less digits than its factorization.

646253244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197299 (or 197294 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 646253244 is about 25421.5114420838. The cubic root of 646253244 is about 864.5714936865.

The spelling of 646253244 in words is "six hundred forty-six million, two hundred fifty-three thousand, two hundred forty-four".