28481865 has 16 divisors (see below), whose sum is σ = 46122048. Its totient is φ = 15006656.

The previous prime is 28481833. The next prime is 28481891. The reversal of 28481865 is 56818482.

It is a cyclic number.

It is not a de Polignac number, because 28481865 - 2⁵ = 28481833 is a prime.

It is a super-2 number, since 2×28481865² = 1622433267756450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10194 + ... + 12683.

It is an arithmetic number, because the mean of its divisors is an integer number (2882628).

Almost surely, 2^28481865 is an apocalyptic number.

It is an amenable number.

28481865 is a deficient number, since it is larger than the sum of its proper divisors (17640183).

28481865 is a wasteful number, since it uses less digits than its factorization.

28481865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22968.

The product of its digits is 122880, while the sum is 42.

The square root of 28481865 is about 5336.8403573650. The cubic root of 28481865 is about 305.3909346981.

The spelling of 28481865 in words is "twenty-eight million, four hundred eighty-one thousand, eight hundred sixty-five".