31043933640 has 80 divisors (see below), whose sum is σ = 104342121180. Its totient is φ = 8278381440.

The previous prime is 31043933629. The next prime is 31043933677. The reversal of 31043933640 is 4633934013.

31043933640 is a `hidden beast` number, since 3 + 1 + 0 + 4 + 3 + 9 + 3 + 3 + 640 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 31034459556 + 9474084 = 176166^2 + 3078^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 31043933595 and 31043933604.

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 19 ways as a sum of consecutive naturals, for example, 4787491 + ... + 4793970.

Almost surely, 2^31043933640 is an apocalyptic number.

31043933640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31043933640 is an abundant number, since it is smaller than the sum of its proper divisors (73298187540).

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

31043933640 is a wasteful number, since it uses less digits than its factorization.

31043933640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9581484 (or 9581471 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 36.

The spelling of 31043933640 in words is "thirty-one billion, forty-three million, nine hundred thirty-three thousand, six hundred forty".