28971888 has 80 divisors (see below), whose sum is σ = 83911296. Its totient is φ = 8536320.

The previous prime is 28971857. The next prime is 28971923. The reversal of 28971888 is 88817982.

It is a happy number.

Its product of digits (516096) is a multiple of the sum of its prime divisors (1536).

It is a self number, because there is not a number n which added to its sum of digits gives 28971888.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18795 + ... + 20277.

Almost surely, 2^28971888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28971888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41955648).

28971888 is an abundant number, since it is smaller than the sum of its proper divisors (54939408).

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

28971888 is a wasteful number, since it uses less digits than its factorization.

28971888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542 (or 1536 counting only the distinct ones).

The product of its digits is 516096, while the sum is 51.

The square root of 28971888 is about 5382.5540406019. The cubic root of 28971888 is about 307.1323757942.

The spelling of 28971888 in words is "twenty-eight million, nine hundred seventy-one thousand, eight hundred eighty-eight".