647990312 has 16 divisors (see below), whose sum is σ = 1234900500. Its totient is φ = 318683520.

The previous prime is 647990257. The next prime is 647990347. The reversal of 647990312 is 213099746.

It can be written as a sum of positive squares in 2 ways, for example, as 624700036 + 23290276 = 24994^2 + 4826^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 647990312.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 663437 + ... + 664412.

Almost surely, 2^647990312 is an apocalyptic number.

It is an amenable number.

647990312 is a deficient number, since it is larger than the sum of its proper divisors (586910188).

647990312 is a wasteful number, since it uses less digits than its factorization.

647990312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327916 (or 1327912 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 647990312 is about 25455.6538317129. The cubic root of 647990312 is about 865.3454296587.

The spelling of 647990312 in words is "six hundred forty-seven million, nine hundred ninety thousand, three hundred twelve".