31998072 has 16 divisors (see below), whose sum is σ = 79995240. Its totient is φ = 10666016.

The previous prime is 31997989. The next prime is 31998073. The reversal of 31998072 is 27089913.

It is a super-2 number, since 2×31998072² = 2047753223434368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31998072.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31998073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 666603 + ... + 666650.

Almost surely, 2^31998072 is an apocalyptic number.

It is an amenable number.

31998072 is an abundant number, since it is smaller than the sum of its proper divisors (47997168).

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

31998072 is a wasteful number, since it uses less digits than its factorization.

31998072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1333262 (or 1333258 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 31998072 is about 5656.6838341912. The cubic root of 31998072 is about 317.4738342047.

The spelling of 31998072 in words is "thirty-one million, nine hundred ninety-eight thousand, seventy-two".