28732569 has 4 divisors (see below), whose sum is σ = 38310096. Its totient is φ = 19155044.

The previous prime is 28732559. The next prime is 28732573. The reversal of 28732569 is 96523782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28732569 - 2²⁴ = 11955353 is a prime.

It is a super-2 number, since 2×28732569² = 1651121042679522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28732569.

It is not an unprimeable number, because it can be changed into a prime (28732559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4788759 + ... + 4788764.

It is an arithmetic number, because the mean of its divisors is an integer number (9577524).

Almost surely, 2^28732569 is an apocalyptic number.

It is an amenable number.

28732569 is a deficient number, since it is larger than the sum of its proper divisors (9577527).

28732569 is an equidigital number, since it uses as much as digits as its factorization.

28732569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9577526.

The product of its digits is 181440, while the sum is 42.

The square root of 28732569 is about 5360.2769518002. The cubic root of 28732569 is about 306.2843591049.

The spelling of 28732569 in words is "twenty-eight million, seven hundred thirty-two thousand, five hundred sixty-nine".