31311463640 has 32 divisors (see below), whose sum is σ = 70461090000. Its totient is φ = 12522754944.

The previous prime is 31311463627. The next prime is 31311463643. The reversal of 31311463640 is 4636411313.

It is a junction number, because it is equal to n+sod(n) for n = 31311463597 and 31311463606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31311463643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 238811 + ... + 345909.

Almost surely, 2^31311463640 is an apocalyptic number.

It is an amenable number.

31311463640 is an abundant number, since it is smaller than the sum of its proper divisors (39149626360).

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

31311463640 is a wasteful number, since it uses less digits than its factorization.

31311463640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114419 (or 114415 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

Adding to 31311463640 its reverse (4636411313), we get a palindrome (35947874953).

The spelling of 31311463640 in words is "thirty-one billion, three hundred eleven million, four hundred sixty-three thousand, six hundred forty".