31157478472320 has 512 divisors, whose sum is σ = 114806233497600. Its totient is φ = 7977310064640.

The previous prime is 31157478472303. The next prime is 31157478472343. The reversal of 31157478472320 is 2327487475113.

31157478472320 is a `hidden beast` number, since 3 + 1 + 1 + 5 + 74 + 78 + 472 + 32 + 0 = 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 pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 67802367 + ... + 68260353.

It is an arithmetic number, because the mean of its divisors is an integer number (224230924800).

Almost surely, 2^{31157478472320} is an apocalyptic number.

31157478472320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31157478472320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57403116748800).

31157478472320 is an abundant number, since it is smaller than the sum of its proper divisors (83648755025280).

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

31157478472320 is a wasteful number, since it uses less digits than its factorization.

31157478472320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 458173 (or 458155 counting only the distinct ones).

The product of its (nonzero) digits is 7902720, while the sum is 54.

The spelling of 31157478472320 in words is "thirty-one trillion, one hundred fifty-seven billion, four hundred seventy-eight million, four hundred seventy-two thousand, three hundred twenty".