28578020 has 24 divisors (see below), whose sum is σ = 63544824. Its totient is φ = 10758656.

The previous prime is 28578019. The next prime is 28578031. The reversal of 28578020 is 2087582.

It can be written as a sum of positive squares in 4 ways, for example, as 4919524 + 23658496 = 2218^2 + 4864^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41687 + ... + 42366.

It is an arithmetic number, because the mean of its divisors is an integer number (2647701).

Almost surely, 2^28578020 is an apocalyptic number.

28578020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28578020 is an abundant number, since it is smaller than the sum of its proper divisors (34966804).

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

28578020 is a wasteful number, since it uses less digits than its factorization.

28578020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84079 (or 84077 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 28578020 is about 5345.8413743769. The cubic root of 28578020 is about 305.7342160788.

The spelling of 28578020 in words is "twenty-eight million, five hundred seventy-eight thousand, twenty".