28558881 has 48 divisors (see below), whose sum is σ = 48484800. Its totient is φ = 16039296.

The previous prime is 28558879. The next prime is 28558897. The reversal of 28558881 is 18885582.

It is not a de Polignac number, because 28558881 - 2¹ = 28558879 is a prime.

It is a super-2 number, since 2×28558881² = 1631219367944322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28553881) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 64246 + ... + 64688.

It is an arithmetic number, because the mean of its divisors is an integer number (1010100).

Almost surely, 2^28558881 is an apocalyptic number.

It is an amenable number.

28558881 is a deficient number, since it is larger than the sum of its proper divisors (19925919).

28558881 is a wasteful number, since it uses less digits than its factorization.

28558881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510 (or 507 counting only the distinct ones).

The product of its digits is 204800, while the sum is 45.

The square root of 28558881 is about 5344.0509915232. The cubic root of 28558881 is about 305.6659496989.

The spelling of 28558881 in words is "twenty-eight million, five hundred fifty-eight thousand, eight hundred eighty-one".