31157693240 has 16 divisors (see below), whose sum is σ = 70104809880. Its totient is φ = 12463077280.

The previous prime is 31157693239. The next prime is 31157693243. The reversal of 31157693240 is 4239675113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31157693243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 389471126 + ... + 389471205.

Almost surely, 2^31157693240 is an apocalyptic number.

It is an amenable number.

31157693240 is an abundant number, since it is smaller than the sum of its proper divisors (38947116640).

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

31157693240 is a wasteful number, since it uses less digits than its factorization.

31157693240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778942342 (or 778942338 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 41.

The spelling of 31157693240 in words is "thirty-one billion, one hundred fifty-seven million, six hundred ninety-three thousand, two hundred forty".