31415928 has 32 divisors (see below), whose sum is σ = 80213760. Its totient is φ = 10248800.

The previous prime is 31415899. The next prime is 31415971. The reversal of 31415928 is 82951413.

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 7 ways as a sum of consecutive naturals, for example, 12798 + ... + 15053.

It is an arithmetic number, because the mean of its divisors is an integer number (2506680).

Almost surely, 2^31415928 is an apocalyptic number.

It is an amenable number.

31415928 is an abundant number, since it is smaller than the sum of its proper divisors (48797832).

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

31415928 is a wasteful number, since it uses less digits than its factorization.

31415928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27907 (or 27903 counting only the distinct ones).

The product of its digits is 8640, while the sum is 33.

The square root of 31415928 is about 5604.9913470049. The cubic root of 31415928 is about 315.5367618319.

The spelling of 31415928 in words is "thirty-one million, four hundred fifteen thousand, nine hundred twenty-eight".