28190944 has 24 divisors (see below), whose sum is σ = 56857248. Its totient is φ = 13751040.

The previous prime is 28190941. The next prime is 28190983. The reversal of 28190944 is 44909182.

It is a happy number.

It is a super-2 number, since 2×28190944² = 1589458647222272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28190941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9432 + ... + 12055.

It is an arithmetic number, because the mean of its divisors is an integer number (2369052).

Almost surely, 2^28190944 is an apocalyptic number.

It is an amenable number.

28190944 is an abundant number, since it is smaller than the sum of its proper divisors (28666304).

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

28190944 is a wasteful number, since it uses less digits than its factorization.

28190944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21538 (or 21530 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28190944 is about 5309.5144787447. The cubic root of 28190944 is about 304.3475940986.

The spelling of 28190944 in words is "twenty-eight million, one hundred ninety thousand, nine hundred forty-four".