28558920 has 64 divisors (see below), whose sum is σ = 92272320. Its totient is φ = 7029504.

The previous prime is 28558909. The next prime is 28558927. The reversal of 28558920 is 2985582.

It is a super-2 number, since 2×28558920² = 1631223823132800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (28558927) 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, 7594 + ... + 10713.

It is an arithmetic number, because the mean of its divisors is an integer number (1441755).

Almost surely, 2^28558920 is an apocalyptic number.

28558920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28558920 is an abundant number, since it is smaller than the sum of its proper divisors (63713400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28558920 is a wasteful number, since it uses less digits than its factorization.

28558920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18334 (or 18330 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 39.

The square root of 28558920 is about 5344.0546404392. The cubic root of 28558920 is about 305.6660888380. Note that the first 3 decimals are identical.

The spelling of 28558920 in words is "twenty-eight million, five hundred fifty-eight thousand, nine hundred twenty".