31887132 has 48 divisors (see below), whose sum is σ = 76501152. Its totient is φ = 10333440.

The previous prime is 31887113. The next prime is 31887137. The reversal of 31887132 is 23178813.

It is a junction number, because it is equal to n+sod(n) for n = 31887093 and 31887102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31887137) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114978 + ... + 115254.

It is an arithmetic number, because the mean of its divisors is an integer number (1593774).

Almost surely, 2^31887132 is an apocalyptic number.

It is an amenable number.

31887132 is an abundant number, since it is smaller than the sum of its proper divisors (44614020).

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

31887132 is a wasteful number, since it uses less digits than its factorization.

31887132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 516 counting only the distinct ones).

The product of its digits is 8064, while the sum is 33.

The square root of 31887132 is about 5646.8692210817. The cubic root of 31887132 is about 317.1065065529.

The spelling of 31887132 in words is "thirty-one million, eight hundred eighty-seven thousand, one hundred thirty-two".