28808765 has 16 divisors (see below), whose sum is σ = 37241856. Its totient is φ = 21331200.

The previous prime is 28808749. The next prime is 28808779. The reversal of 28808765 is 56780882.

It is not a de Polignac number, because 28808765 - 2⁴ = 28808749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 476 + ... + 7605.

It is an arithmetic number, because the mean of its divisors is an integer number (2327616).

Almost surely, 2^28808765 is an apocalyptic number.

It is an amenable number.

28808765 is a deficient number, since it is larger than the sum of its proper divisors (8433091).

28808765 is a wasteful number, since it uses less digits than its factorization.

28808765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8140.

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 28808765 is about 5367.3797145348. The cubic root of 28808765 is about 306.5548656468.

The spelling of 28808765 in words is "twenty-eight million, eight hundred eight thousand, seven hundred sixty-five".