28128790 has 16 divisors (see below), whose sum is σ = 50738400. Its totient is φ = 11227840.

The previous prime is 28128787. The next prime is 28128809. The reversal of 28128790 is 9782182.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2511 + ... + 7909.

It is an arithmetic number, because the mean of its divisors is an integer number (3171150).

Almost surely, 2^28128790 is an apocalyptic number.

28128790 is a deficient number, since it is larger than the sum of its proper divisors (22609610).

28128790 is a wasteful number, since it uses less digits than its factorization.

28128790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5927.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28128790 is about 5303.6581714888. The cubic root of 28128790 is about 304.1237593403.

The spelling of 28128790 in words is "twenty-eight million, one hundred twenty-eight thousand, seven hundred ninety".