28555020 has 72 divisors (see below), whose sum is σ = 93287376. Its totient is φ = 7028352.

The previous prime is 28554979. The next prime is 28555049. The reversal of 28555020 is 2055582.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3762 + ... + 8441.

It is an arithmetic number, because the mean of its divisors is an integer number (1295658).

Almost surely, 2^28555020 is an apocalyptic number.

28555020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28555020 is an abundant number, since it is smaller than the sum of its proper divisors (64732356).

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

28555020 is a wasteful number, since it uses less digits than its factorization.

28555020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12231 (or 12226 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 27.

The square root of 28555020 is about 5343.6897365023. The cubic root of 28555020 is about 305.6521743060.

It can be divided in two parts, 2855 and 5020, that added together give a triangular number (7875 = T₁₂₅).

The spelling of 28555020 in words is "twenty-eight million, five hundred fifty-five thousand, twenty".