28765917 has 12 divisors (see below), whose sum is σ = 41801760. Its totient is φ = 19061448.

The previous prime is 28765907. The next prime is 28765967. The reversal of 28765917 is 71956782.

It is not a de Polignac number, because 28765917 - 2⁸ = 28765661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28765907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8067 + ... + 11072.

It is an arithmetic number, because the mean of its divisors is an integer number (3483480).

Almost surely, 2^28765917 is an apocalyptic number.

It is an amenable number.

28765917 is a deficient number, since it is larger than the sum of its proper divisors (13035843).

28765917 is a wasteful number, since it uses less digits than its factorization.

28765917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19312 (or 19309 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 28765917 is about 5363.3867099063. The cubic root of 28765917 is about 306.4028079842.

The spelling of 28765917 in words is "twenty-eight million, seven hundred sixty-five thousand, nine hundred seventeen".