28178244 has 72 divisors (see below), whose sum is σ = 73993920. Its totient is φ = 9035712.

The previous prime is 28178237. The next prime is 28178263. The reversal of 28178244 is 44287182.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

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

It is a junction number, because it is equal to n+sod(n) for n = 28178199 and 28178208.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 168649 + ... + 168815.

Almost surely, 2^28178244 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 28178244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36996960).

28178244 is an abundant number, since it is smaller than the sum of its proper divisors (45815676).

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

28178244 is a wasteful number, since it uses less digits than its factorization.

28178244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329 (or 324 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 28178244 is about 5308.3183777916. The cubic root of 28178244 is about 304.3018844431.

The spelling of 28178244 in words is "twenty-eight million, one hundred seventy-eight thousand, two hundred forty-four".