28176864 has 72 divisors (see below), whose sum is σ = 76822200. Its totient is φ = 9042432.

The previous prime is 28176857. The next prime is 28176877. The reversal of 28176864 is 46867182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 80562 + ... + 80910.

It is an arithmetic number, because the mean of its divisors is an integer number (1066975).

Almost surely, 2^28176864 is an apocalyptic number.

28176864 is a gapful number since it is divisible by the number (24) 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 28176864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38411100).

28176864 is an abundant number, since it is smaller than the sum of its proper divisors (48645336).

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

28176864 is a wasteful number, since it uses less digits than its factorization.

28176864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420 (or 383 counting only the distinct ones).

The product of its digits is 129024, while the sum is 42.

The square root of 28176864 is about 5308.1883915325. The cubic root of 28176864 is about 304.2969167399.

The spelling of 28176864 in words is "twenty-eight million, one hundred seventy-six thousand, eight hundred sixty-four".