28392765 has 16 divisors (see below), whose sum is σ = 45496896. Its totient is φ = 15120000.

The previous prime is 28392761. The next prime is 28392779. The reversal of 28392765 is 56729382.

It is not a de Polignac number, because 28392765 - 2² = 28392761 is a prime.

It is a super-2 number, since 2×28392765² = 1612298208690450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28392761) 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, 14865 + ... + 16665.

It is an arithmetic number, because the mean of its divisors is an integer number (2843556).

Almost surely, 2^28392765 is an apocalyptic number.

It is an amenable number.

28392765 is a deficient number, since it is larger than the sum of its proper divisors (17104131).

28392765 is a wasteful number, since it uses less digits than its factorization.

28392765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2860.

The product of its digits is 181440, while the sum is 42.

The square root of 28392765 is about 5328.4861827727. The cubic root of 28392765 is about 305.0721499113.

The spelling of 28392765 in words is "twenty-eight million, three hundred ninety-two thousand, seven hundred sixty-five".