647579402 has 16 divisors (see below), whose sum is σ = 1056308040. Its totient is φ = 296506368.

The previous prime is 647579399. The next prime is 647579417. The reversal of 647579402 is 204975746.

It can be written as a sum of positive squares in 4 ways, for example, as 603635761 + 43943641 = 24569^2 + 6629^2 .

It is a super-3 number, since 3×647579402³ (a number of 27 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 256127 + ... + 258642.

Almost surely, 2^647579402 is an apocalyptic number.

647579402 is a deficient number, since it is larger than the sum of its proper divisors (408728638).

647579402 is a wasteful number, since it uses less digits than its factorization.

647579402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514825.

The product of its (nonzero) digits is 423360, while the sum is 44.

The square root of 647579402 is about 25447.5814567907. The cubic root of 647579402 is about 865.1624771919.

The spelling of 647579402 in words is "six hundred forty-seven million, five hundred seventy-nine thousand, four hundred two".