28769428 has 24 divisors (see below), whose sum is σ = 51287040. Its totient is φ = 14118720.

The previous prime is 28769383. The next prime is 28769449. The reversal of 28769428 is 82496782.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74925 + ... + 75307.

It is an arithmetic number, because the mean of its divisors is an integer number (2136960).

Almost surely, 2^28769428 is an apocalyptic number.

It is an amenable number.

28769428 is a deficient number, since it is larger than the sum of its proper divisors (22517612).

28769428 is a wasteful number, since it uses less digits than its factorization.

28769428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687 (or 685 counting only the distinct ones).

The product of its digits is 387072, while the sum is 46.

The square root of 28769428 is about 5363.7140117646. The cubic root of 28769428 is about 306.4152733901.

The spelling of 28769428 in words is "twenty-eight million, seven hundred sixty-nine thousand, four hundred twenty-eight".