31523396840 has 64 divisors (see below), whose sum is σ = 77140017360. Its totient is φ = 11524147200.

The previous prime is 31523396813. The next prime is 31523396851. The reversal of 31523396840 is 4869332513.

It can be written as a sum of positive squares in 8 ways, for example, as 25205372644 + 6318024196 = 158762^2 + 79486^2 .

It is a junction number, because it is equal to n+sod(n) for n = 31523396791 and 31523396800.

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, 247589 + ... + 352628.

Almost surely, 2^31523396840 is an apocalyptic number.

It is an amenable number.

31523396840 is an abundant number, since it is smaller than the sum of its proper divisors (45616620520).

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

31523396840 is a wasteful number, since it uses less digits than its factorization.

31523396840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600342 (or 600338 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 31523396840 in words is "thirty-one billion, five hundred twenty-three million, three hundred ninety-six thousand, eight hundred forty".