28012765 has 16 divisors (see below), whose sum is σ = 36925056. Its totient is φ = 20232000.

The previous prime is 28012757. The next prime is 28012769. The reversal of 28012765 is 56721082.

It is not a de Polignac number, because 28012765 - 2³ = 28012757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28012769) 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, 6619 + ... + 9991.

It is an arithmetic number, because the mean of its divisors is an integer number (2307816).

Almost surely, 2^28012765 is an apocalyptic number.

It is an amenable number.

28012765 is a deficient number, since it is larger than the sum of its proper divisors (8912291).

28012765 is a wasteful number, since it uses less digits than its factorization.

28012765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3540.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 28012765 is about 5292.7086638129. The cubic root of 28012765 is about 303.7050354843.

The spelling of 28012765 in words is "twenty-eight million, twelve thousand, seven hundred sixty-five".