28972188 has 96 divisors (see below), whose sum is σ = 90406400. Its totient is φ = 7838208.

The previous prime is 28972159. The next prime is 28972193. The reversal of 28972188 is 88127982.

It is a happy number.

Its product of digits (129024) is a multiple of the sum of its prime divisors (2048).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13356 + ... + 15372.

Almost surely, 2^28972188 is an apocalyptic number.

28972188 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28972188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45203200).

28972188 is an abundant number, since it is smaller than the sum of its proper divisors (61434212).

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

28972188 is a wasteful number, since it uses less digits than its factorization.

28972188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056 (or 2048 counting only the distinct ones).

The product of its digits is 129024, while the sum is 45.

The square root of 28972188 is about 5382.5819083410. The cubic root of 28972188 is about 307.1334358953.

The spelling of 28972188 in words is "twenty-eight million, nine hundred seventy-two thousand, one hundred eighty-eight".