31847423728 has 10 divisors (see below), whose sum is σ = 61704383504. Its totient is φ = 15923711856.

The previous prime is 31847423701. The next prime is 31847423749. The reversal of 31847423728 is 82732474813.

It is a super-2 number, since 2×31847423728² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 995231976 + ... + 995232007.

Almost surely, 2^31847423728 is an apocalyptic number.

It is an amenable number.

31847423728 is a deficient number, since it is larger than the sum of its proper divisors (29856959776).

31847423728 is a wasteful number, since it uses less digits than its factorization.

31847423728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1990463991 (or 1990463985 counting only the distinct ones).

The product of its digits is 1806336, while the sum is 49.

The spelling of 31847423728 in words is "thirty-one billion, eight hundred forty-seven million, four hundred twenty-three thousand, seven hundred twenty-eight".