31687805007 has 12 divisors (see below), whose sum is σ = 45776011944. Its totient is φ = 21123016560.

The previous prime is 31687804991. The next prime is 31687805063. The reversal of 31687805007 is 70050878613.

31687805007 is a `hidden beast` number, since 3 + 1 + 68 + 7 + 80 + 500 + 7 = 666.

It is not a de Polignac number, because 31687805007 - 2⁴ = 31687804991 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31687825007) 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, 87888 + ... + 266645.

It is an arithmetic number, because the mean of its divisors is an integer number (3814667662).

Almost surely, 2^31687805007 is an apocalyptic number.

31687805007 is a deficient number, since it is larger than the sum of its proper divisors (14088206937).

31687805007 is a wasteful number, since it uses less digits than its factorization.

31687805007 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364470 (or 364467 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 31687805007 in words is "thirty-one billion, six hundred eighty-seven million, eight hundred five thousand, seven".