31068891936 has 72 divisors (see below), whose sum is σ = 88377926364. Its totient is φ = 10353277440.

The previous prime is 31068891913. The next prime is 31068891961. The reversal of 31068891936 is 63919886013.

31068891936 is a `hidden beast` number, since 310 + 68 + 89 + 193 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30640401936 + 428490000 = 175044^2 + 20700^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×31068891936² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1114326 + ... + 1141866.

Almost surely, 2^31068891936 is an apocalyptic number.

31068891936 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

31068891936 is an abundant number, since it is smaller than the sum of its proper divisors (57309034428).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31068891936 is a wasteful number, since it uses less digits than its factorization.

31068891936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31474 (or 31463 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 54.

The spelling of 31068891936 in words is "thirty-one billion, sixty-eight million, eight hundred ninety-one thousand, nine hundred thirty-six".