28735765 has 16 divisors (see below), whose sum is σ = 35138880. Its totient is φ = 22556160.

The previous prime is 28735757. The next prime is 28735783. The reversal of 28735765 is 56753782.

It is not a de Polignac number, because 28735765 - 2³ = 28735757 is a prime.

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, 86650 + ... + 86980.

It is an arithmetic number, because the mean of its divisors is an integer number (2196180).

Almost surely, 2^28735765 is an apocalyptic number.

It is an amenable number.

28735765 is a deficient number, since it is larger than the sum of its proper divisors (6403115).

28735765 is a wasteful number, since it uses less digits than its factorization.

28735765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612.

The product of its digits is 352800, while the sum is 43.

The square root of 28735765 is about 5360.5750624350. The cubic root of 28735765 is about 306.2957149582.

The spelling of 28735765 in words is "twenty-eight million, seven hundred thirty-five thousand, seven hundred sixty-five".