28356912 has 80 divisors (see below), whose sum is σ = 83432160. Its totient is φ = 9216000.

The previous prime is 28356877. The next prime is 28356929. The reversal of 28356912 is 21965382.

28356912 is a `hidden beast` number, since 2 + 83 + 569 + 12 = 666.

It is a super-2 number, since 2×28356912² = 1608228916351488, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 16912 + ... + 18512.

It is an arithmetic number, because the mean of its divisors is an integer number (1042902).

Almost surely, 2^28356912 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 28356912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41716080).

28356912 is an abundant number, since it is smaller than the sum of its proper divisors (55075248).

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

28356912 is a wasteful number, since it uses less digits than its factorization.

28356912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1659 (or 1647 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28356912 is about 5325.1208436992. The cubic root of 28356912 is about 304.9436857420.

The spelling of 28356912 in words is "twenty-eight million, three hundred fifty-six thousand, nine hundred twelve".