28575491 has 8 divisors (see below), whose sum is σ = 32706144. Its totient is φ = 24456960.

The previous prime is 28575473. The next prime is 28575509. The reversal of 28575491 is 19457582.

It is an interprime number because it is at equal distance from previous prime (28575473) and next prime (28575509).

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-28575491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28575451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2771 + ... + 8051.

It is an arithmetic number, because the mean of its divisors is an integer number (4088268).

Almost surely, 2^28575491 is an apocalyptic number.

28575491 is a deficient number, since it is larger than the sum of its proper divisors (4130653).

28575491 is an equidigital number, since it uses as much as digits as its factorization.

28575491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061.

The product of its digits is 100800, while the sum is 41.

The square root of 28575491 is about 5345.6048301385. The cubic root of 28575491 is about 305.7251972053.

The spelling of 28575491 in words is "twenty-eight million, five hundred seventy-five thousand, four hundred ninety-one".