647630631 has 12 divisors (see below), whose sum is σ = 935737608. Its totient is φ = 431628624.

The previous prime is 647630617. The next prime is 647630653. The reversal of 647630631 is 136036746.

It is a happy number.

647630631 is a `hidden beast` number, since 647 + 6 + 3 + 0 + 6 + 3 + 1 = 666.

647630631 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 647630631 - 2⁶ = 647630567 is a prime.

It is a super-2 number, since 2×647630631² = 838850868418916322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (647630671) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31021 + ... + 47513.

It is an arithmetic number, because the mean of its divisors is an integer number (77978134).

Almost surely, 2^647630631 is an apocalyptic number.

647630631 is a deficient number, since it is larger than the sum of its proper divisors (288106977).

647630631 is a wasteful number, since it uses less digits than its factorization.

647630631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20862 (or 20859 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 36.

The square root of 647630631 is about 25448.5879961934. The cubic root of 647630631 is about 865.1852904766.

The spelling of 647630631 in words is "six hundred forty-seven million, six hundred thirty thousand, six hundred thirty-one".