28392880 has 20 divisors (see below), whose sum is σ = 66013632. Its totient is φ = 11357120.

The previous prime is 28392863. The next prime is 28392893. The reversal of 28392880 is 8829382.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177376 + ... + 177535.

Almost surely, 2^28392880 is an apocalyptic number.

28392880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28392880 is an abundant number, since it is smaller than the sum of its proper divisors (37620752).

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

28392880 is a wasteful number, since it uses less digits than its factorization.

28392880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 354924 (or 354918 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 28392880 is about 5328.4969738192. The cubic root of 28392880 is about 305.0725617914.

The spelling of 28392880 in words is "twenty-eight million, three hundred ninety-two thousand, eight hundred eighty".