28806765 has 16 divisors (see below), whose sum is σ = 49636608. Its totient is φ = 14181696.

The previous prime is 28806761. The next prime is 28806779. The reversal of 28806765 is 56760882.

It is not a de Polignac number, because 28806765 - 2² = 28806761 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28806761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73669 + ... + 74058.

It is an arithmetic number, because the mean of its divisors is an integer number (3102288).

Almost surely, 2^28806765 is an apocalyptic number.

It is an amenable number.

28806765 is a deficient number, since it is larger than the sum of its proper divisors (20829843).

28806765 is a wasteful number, since it uses less digits than its factorization.

28806765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147748.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 28806765 is about 5367.1934006518. The cubic root of 28806765 is about 306.5477714642.

The spelling of 28806765 in words is "twenty-eight million, eight hundred six thousand, seven hundred sixty-five".