28565181 has 12 divisors (see below), whose sum is σ = 41338752. Its totient is φ = 19007496.

The previous prime is 28565179. The next prime is 28565209. The reversal of 28565181 is 18156582.

It is not a de Polignac number, because 28565181 - 2¹ = 28565179 is a prime.

It is a super-2 number, since 2×28565181² = 1631939131125522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28565111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2580 + ... + 7986.

It is an arithmetic number, because the mean of its divisors is an integer number (3444896).

Almost surely, 2^28565181 is an apocalyptic number.

It is an amenable number.

28565181 is a deficient number, since it is larger than the sum of its proper divisors (12773571).

28565181 is a wasteful number, since it uses less digits than its factorization.

28565181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6000 (or 5997 counting only the distinct ones).

The product of its digits is 19200, while the sum is 36.

The square root of 28565181 is about 5344.6403995030. The cubic root of 28565181 is about 305.6884243645.

The spelling of 28565181 in words is "twenty-eight million, five hundred sixty-five thousand, one hundred eighty-one".