28597765 has 16 divisors (see below), whose sum is σ = 39454848. Its totient is φ = 19492416.

The previous prime is 28597753. The next prime is 28597771. The reversal of 28597765 is 56779582.

28597765 = 469² + 470² + ... + 573².

It is a cyclic number.

It is not a de Polignac number, because 28597765 - 2⁹ = 28597253 is a prime.

It is a Duffinian number.

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, 3694 + ... + 8416.

It is an arithmetic number, because the mean of its divisors is an integer number (2465928).

Almost surely, 2^28597765 is an apocalyptic number.

It is an amenable number.

28597765 is a deficient number, since it is larger than the sum of its proper divisors (10857083).

28597765 is a wasteful number, since it uses less digits than its factorization.

28597765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4908.

The product of its digits is 1058400, while the sum is 49.

The square root of 28597765 is about 5347.6878181135. The cubic root of 28597765 is about 305.8046120491.

The spelling of 28597765 in words is "twenty-eight million, five hundred ninety-seven thousand, seven hundred sixty-five".