28575997 has 8 divisors (see below), whose sum is σ = 30365496. Its totient is φ = 26798592.

The previous prime is 28575983. The next prime is 28576021. The reversal of 28575997 is 79957582.

It can be written as a sum of positive squares in 4 ways, for example, as 5861241 + 22714756 = 2421^2 + 4766^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28575997 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 (28575977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2113 + ... + 7849.

It is an arithmetic number, because the mean of its divisors is an integer number (3795687).

Almost surely, 2^28575997 is an apocalyptic number.

It is an amenable number.

28575997 is a deficient number, since it is larger than the sum of its proper divisors (1789499).

28575997 is a wasteful number, since it uses less digits than its factorization.

28575997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6047.

The product of its digits is 1587600, while the sum is 52.

The square root of 28575997 is about 5345.6521585303. The cubic root of 28575997 is about 305.7270017358.

The spelling of 28575997 in words is "twenty-eight million, five hundred seventy-five thousand, nine hundred ninety-seven".