31688242 has 8 divisors (see below), whose sum is σ = 49171500. Its totient is φ = 15297744.

The previous prime is 31688201. The next prime is 31688281. The reversal of 31688242 is 24288613.

It can be written as a sum of positive squares in 2 ways, for example, as 31685641 + 2601 = 5629^2 + 51^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 31688198 and 31688207.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 273117 + ... + 273232.

Almost surely, 2^31688242 is an apocalyptic number.

31688242 is a deficient number, since it is larger than the sum of its proper divisors (17483258).

31688242 is a wasteful number, since it uses less digits than its factorization.

31688242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546380.

The product of its digits is 18432, while the sum is 34.

The square root of 31688242 is about 5629.2310309668. The cubic root of 31688242 is about 316.4458335994.

The spelling of 31688242 in words is "thirty-one million, six hundred eighty-eight thousand, two hundred forty-two".