31618472 has 8 divisors (see below), whose sum is σ = 59284650. Its totient is φ = 15809232.

The previous prime is 31618463. The next prime is 31618519. The reversal of 31618472 is 27481613.

It can be written as a sum of positive squares in only one way, i.e., 29964676 + 1653796 = 5474^2 + 1286^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×31618472² = 1999455543229568, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 1976147 + ... + 1976162.

Almost surely, 2^31618472 is an apocalyptic number.

It is an amenable number.

31618472 is a deficient number, since it is larger than the sum of its proper divisors (27666178).

31618472 is a wasteful number, since it uses less digits than its factorization.

31618472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3952315 (or 3952311 counting only the distinct ones).

The product of its digits is 8064, while the sum is 32.

The square root of 31618472 is about 5623.0304996505. The cubic root of 31618472 is about 316.2134166934.

The spelling of 31618472 in words is "thirty-one million, six hundred eighteen thousand, four hundred seventy-two".