30988428 has 12 divisors (see below), whose sum is σ = 72306360. Its totient is φ = 10329472.

The previous prime is 30988421. The next prime is 30988439. The reversal of 30988428 is 82488903.

It is a happy number.

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

It is a super-2 number, since 2×30988428² = 1920565339822368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 30988428.

It is not an unprimeable number, because it can be changed into a prime (30988421) 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, 1291173 + ... + 1291196.

It is an arithmetic number, because the mean of its divisors is an integer number (6025530).

Almost surely, 2^30988428 is an apocalyptic number.

It is an amenable number.

30988428 is an abundant number, since it is smaller than the sum of its proper divisors (41317932).

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

30988428 is a wasteful number, since it uses less digits than its factorization.

30988428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2582376 (or 2582374 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 42.

The square root of 30988428 is about 5566.7250695539. The cubic root of 30988428 is about 314.0989721411.

The spelling of 30988428 in words is "thirty million, nine hundred eighty-eight thousand, four hundred twenty-eight".