31689324 has 18 divisors (see below), whose sum is σ = 80103660. Its totient is φ = 10563096.

The previous prime is 31689277. The next prime is 31689337. The reversal of 31689324 is 42398613.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 880259 = 31689324 / (3 + 1 + 6 + 8 + 9 + 3 + 2 + 4).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 440094 + ... + 440165.

Almost surely, 2^31689324 is an apocalyptic number.

It is an amenable number.

31689324 is an abundant number, since it is smaller than the sum of its proper divisors (48414336).

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

31689324 is a wasteful number, since it uses less digits than its factorization.

31689324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880269 (or 880264 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 31689324 is about 5629.3271356353. The cubic root of 31689324 is about 316.4494352560.

The spelling of 31689324 in words is "thirty-one million, six hundred eighty-nine thousand, three hundred twenty-four".