31515490978080 has 96 divisors (see below), whose sum is σ = 99573717918528. Its totient is φ = 8378740761600.

The previous prime is 31515490978051. The next prime is 31515490978121. The reversal of 31515490978080 is 8087909451513.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99021291 + ... + 99339050.

It is an arithmetic number, because the mean of its divisors is an integer number (1037226228318).

Almost surely, 2^{31515490978080} is an apocalyptic number.

31515490978080 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31515490978080 is an abundant number, since it is smaller than the sum of its proper divisors (68058226940448).

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

31515490978080 is a wasteful number, since it uses less digits than its factorization.

31515490978080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198360690 (or 198360682 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 60.

The spelling of 31515490978080 in words is "thirty-one trillion, five hundred fifteen billion, four hundred ninety million, nine hundred seventy-eight thousand, eighty".