31687690630 has 16 divisors (see below), whose sum is σ = 57387771504. Its totient is φ = 12597314400.

The previous prime is 31687690621. The next prime is 31687690649. The reversal of 31687690630 is 3609678613.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9718521 + ... + 9721780.

It is an arithmetic number, because the mean of its divisors is an integer number (3586735719).

Almost surely, 2^31687690630 is an apocalyptic number.

31687690630 is a deficient number, since it is larger than the sum of its proper divisors (25700080874).

31687690630 is a wasteful number, since it uses less digits than its factorization.

31687690630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19440471.

The product of its (nonzero) digits is 979776, while the sum is 49.

The spelling of 31687690630 in words is "thirty-one billion, six hundred eighty-seven million, six hundred ninety thousand, six hundred thirty".