31027791240 has 48 divisors (see below), whose sum is σ = 100840322700. Its totient is φ = 8274077568.

The previous prime is 31027791233. The next prime is 31027791257. The reversal of 31027791240 is 4219772013.

It can be written as a sum of positive squares in 2 ways, for example, as 30772878084 + 254913156 = 175422^2 + 15966^2 .

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 = 31027791195 and 31027791204.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43093795 + ... + 43094514.

Almost surely, 2^31027791240 is an apocalyptic number.

31027791240 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31027791240 is an abundant number, since it is smaller than the sum of its proper divisors (69812531460).

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

31027791240 is a wasteful number, since it uses less digits than its factorization.

31027791240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86188326 (or 86188319 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The spelling of 31027791240 in words is "thirty-one billion, twenty-seven million, seven hundred ninety-one thousand, two hundred forty".