28375872 has 112 divisors (see below), whose sum is σ = 87977472. Its totient is φ = 7902720.

The previous prime is 28375871. The next prime is 28375883. The reversal of 28375872 is 27857382.

It is a tau number, because it is divible by the number of its divisors (112).

It is a super-2 number, since 2×28375872² = 1610380223520768, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28375871) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57547 + ... + 58037.

Almost surely, 2^28375872 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 28375872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43988736).

28375872 is an abundant number, since it is smaller than the sum of its proper divisors (59601600).

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

28375872 is a wasteful number, since it uses less digits than its factorization.

28375872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 546 counting only the distinct ones).

The product of its digits is 188160, while the sum is 42.

The square root of 28375872 is about 5326.9007875124. The cubic root of 28375872 is about 305.0116344214.

The spelling of 28375872 in words is "twenty-eight million, three hundred seventy-five thousand, eight hundred seventy-two".