31072768 has 20 divisors (see below), whose sum is σ = 62085870. Its totient is φ = 15536128.

The previous prime is 31072759. The next prime is 31072799. The reversal of 31072768 is 86727013.

It can be written as a sum of positive squares in only one way, i.e., 25080064 + 5992704 = 5008^2 + 2448^2 .

It is a super-2 number, since 2×31072768² = 1931033822363648, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 29833 + ... + 30856.

Almost surely, 2^31072768 is an apocalyptic number.

It is an amenable number.

31072768 is a deficient number, since it is larger than the sum of its proper divisors (31013102).

31072768 is an frugal number, since it uses more digits than its factorization.

31072768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60707 (or 60691 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 34.

The square root of 31072768 is about 5574.2952917835. The cubic root of 31072768 is about 314.3836710005.

The spelling of 31072768 in words is "thirty-one million, seventy-two thousand, seven hundred sixty-eight".