31612790638440 has 128 divisors (see below), whose sum is σ = 114955602364800. Its totient is φ = 7663706818560.

The previous prime is 31612790638423. The next prime is 31612790638501. The reversal of 31612790638440 is 4483609721613.

31612790638440 is a `hidden beast` number, since 3 + 1 + 61 + 27 + 90 + 6 + 38 + 440 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1330492777 + ... + 1330516536.

It is an arithmetic number, because the mean of its divisors is an integer number (898090643475).

Almost surely, 2^{31612790638440} is an apocalyptic number.

31612790638440 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31612790638440 is an abundant number, since it is smaller than the sum of its proper divisors (83342811726360).

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

31612790638440 is a wasteful number, since it uses less digits than its factorization.

31612790638440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2661009344 (or 2661009334 counting only the distinct ones).

The product of its (nonzero) digits is 5225472, while the sum is 54.

The spelling of 31612790638440 in words is "thirty-one trillion, six hundred twelve billion, seven hundred ninety million, six hundred thirty-eight thousand, four hundred forty".