28565397 has 24 divisors (see below), whose sum is σ = 48310080. Its totient is φ = 15923520.

The previous prime is 28565371. The next prime is 28565399. The reversal of 28565397 is 79356582.

It is a happy number.

It is not a de Polignac number, because 28565397 - 2⁷ = 28565269 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28565399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2947 + ... + 8112.

It is an arithmetic number, because the mean of its divisors is an integer number (2012920).

Almost surely, 2^28565397 is an apocalyptic number.

It is an amenable number.

28565397 is a deficient number, since it is larger than the sum of its proper divisors (19744683).

28565397 is a wasteful number, since it uses less digits than its factorization.

28565397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11113 (or 11110 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 28565397 is about 5344.6606066241. The cubic root of 28565397 is about 305.6891948659.

The spelling of 28565397 in words is "twenty-eight million, five hundred sixty-five thousand, three hundred ninety-seven".