30998868 has 12 divisors (see below), whose sum is σ = 72330720. Its totient is φ = 10332952.

The previous prime is 30998867. The next prime is 30998879. The reversal of 30998868 is 86889903.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 30998868.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30998867) 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, 1291608 + ... + 1291631.

It is an arithmetic number, because the mean of its divisors is an integer number (6027560).

Almost surely, 2^30998868 is an apocalyptic number.

It is an amenable number.

30998868 is an abundant number, since it is smaller than the sum of its proper divisors (41331852).

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

30998868 is a wasteful number, since it uses less digits than its factorization.

30998868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2583246 (or 2583244 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 30998868 is about 5567.6627053010. The cubic root of 30998868 is about 314.1342414906.

The spelling of 30998868 in words is "thirty million, nine hundred ninety-eight thousand, eight hundred sixty-eight".