31488313840 has 40 divisors (see below), whose sum is σ = 73480529088. Its totient is φ = 12548839680.

The previous prime is 31488313751. The next prime is 31488313841. The reversal of 31488313840 is 4831388413.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31488313841) 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, 704527 + ... + 747886.

Almost surely, 2^31488313840 is an apocalyptic number.

It is an amenable number.

31488313840 is an abundant number, since it is smaller than the sum of its proper divisors (41992215248).

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

31488313840 is a wasteful number, since it uses less digits than its factorization.

31488313840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1452697 (or 1452691 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 43.

The spelling of 31488313840 in words is "thirty-one billion, four hundred eighty-eight million, three hundred thirteen thousand, eight hundred forty".