28122765 has 16 divisors (see below), whose sum is σ = 49087296. Its totient is φ = 13635200.

The previous prime is 28122727. The next prime is 28122791. The reversal of 28122765 is 56722182.

It is not a de Polignac number, because 28122765 - 2⁷ = 28122637 is a prime.

It is a super-3 number, since 3×28122765³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 85056 + ... + 85385.

It is an arithmetic number, because the mean of its divisors is an integer number (3067956).

Almost surely, 2^28122765 is an apocalyptic number.

It is an amenable number.

28122765 is a deficient number, since it is larger than the sum of its proper divisors (20964531).

28122765 is a wasteful number, since it uses less digits than its factorization.

28122765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170460.

The product of its digits is 13440, while the sum is 33.

The square root of 28122765 is about 5303.0901368919. The cubic root of 28122765 is about 304.1020440266.

The spelling of 28122765 in words is "twenty-eight million, one hundred twenty-two thousand, seven hundred sixty-five".