28558905 has 16 divisors (see below), whose sum is σ = 47169024. Its totient is φ = 14739840.

The previous prime is 28558897. The next prime is 28558909. The reversal of 28558905 is 50985582.

It is not a de Polignac number, because 28558905 - 2³ = 28558897 is a prime.

It is a super-2 number, since 2×28558905² = 1631222109598050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28558909) 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, 30244 + ... + 31173.

It is an arithmetic number, because the mean of its divisors is an integer number (2948064).

Almost surely, 2^28558905 is an apocalyptic number.

It is an amenable number.

28558905 is a deficient number, since it is larger than the sum of its proper divisors (18610119).

28558905 is a wasteful number, since it uses less digits than its factorization.

28558905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61456.

The product of its (nonzero) digits is 144000, while the sum is 42.

The square root of 28558905 is about 5344.0532370103. The cubic root of 28558905 is about 305.6660353230. Note that the first 3 decimals are identical.

The spelling of 28558905 in words is "twenty-eight million, five hundred fifty-eight thousand, nine hundred five".