31387480 has 16 divisors (see below), whose sum is σ = 70621920. Its totient is φ = 12554976.

The previous prime is 31387453. The next prime is 31387513. The reversal of 31387480 is 8478313.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 392304 + ... + 392383.

It is an arithmetic number, because the mean of its divisors is an integer number (4413870).

Almost surely, 2^31387480 is an apocalyptic number.

It is an amenable number.

31387480 is an abundant number, since it is smaller than the sum of its proper divisors (39234440).

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

31387480 is a wasteful number, since it uses less digits than its factorization.

31387480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784698 (or 784694 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 31387480 is about 5602.4530341628. The cubic root of 31387480 is about 315.4414906198.

The spelling of 31387480 in words is "thirty-one million, three hundred eighty-seven thousand, four hundred eighty".