31664642 has 8 divisors (see below), whose sum is σ = 50290956. Its totient is φ = 14900992.

The previous prime is 31664639. The next prime is 31664653. The reversal of 31664642 is 24646613.

It can be written as a sum of positive squares in 2 ways, for example, as 27258841 + 4405801 = 5221^2 + 2099^2 .

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 = 31664599 and 31664608.

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, 465623 + ... + 465690.

Almost surely, 2^31664642 is an apocalyptic number.

31664642 is a deficient number, since it is larger than the sum of its proper divisors (18626314).

31664642 is a wasteful number, since it uses less digits than its factorization.

31664642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931332.

The product of its digits is 20736, while the sum is 32.

The square root of 31664642 is about 5627.1344394816. The cubic root of 31664642 is about 316.3672558058.

The spelling of 31664642 in words is "thirty-one million, six hundred sixty-four thousand, six hundred forty-two".