28394569 has 16 divisors (see below), whose sum is σ = 34864000. Its totient is φ = 23051952.

The previous prime is 28394563. The next prime is 28394579. The reversal of 28394569 is 96549382.

It is not a de Polignac number, because 28394569 - 2⁵ = 28394537 is a prime.

It is a super-2 number, since 2×28394569² = 1612503097391522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28394563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4339 + ... + 8695.

It is an arithmetic number, because the mean of its divisors is an integer number (2179000).

Almost surely, 2^28394569 is an apocalyptic number.

It is an amenable number.

28394569 is a deficient number, since it is larger than the sum of its proper divisors (6469431).

28394569 is an equidigital number, since it uses as much as digits as its factorization.

28394569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4397 (or 4383 counting only the distinct ones).

The product of its digits is 466560, while the sum is 46.

The square root of 28394569 is about 5328.6554589315. The cubic root of 28394569 is about 305.0786109294.

The spelling of 28394569 in words is "twenty-eight million, three hundred ninety-four thousand, five hundred sixty-nine".