31887436664 has 8 divisors (see below), whose sum is σ = 59788943760. Its totient is φ = 15943718328.

The previous prime is 31887436663. The next prime is 31887436667. The reversal of 31887436664 is 46663478813.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31887436664² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31887436663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992964784 + ... + 1992964799.

It is an arithmetic number, because the mean of its divisors is an integer number (7473617970).

Almost surely, 2^31887436664 is an apocalyptic number.

It is an amenable number.

31887436664 is a deficient number, since it is larger than the sum of its proper divisors (27901507096).

31887436664 is a wasteful number, since it uses less digits than its factorization.

31887436664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3985929589 (or 3985929585 counting only the distinct ones).

The product of its digits is 13934592, while the sum is 56.

The spelling of 31887436664 in words is "thirty-one billion, eight hundred eighty-seven million, four hundred thirty-six thousand, six hundred sixty-four".