28579820 has 12 divisors (see below), whose sum is σ = 60017664. Its totient is φ = 11431920.

The previous prime is 28579801. The next prime is 28579853. The reversal of 28579820 is 2897582.

It is a happy number.

It is a super-2 number, since 2×28579820² = 1633612222464800, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 714476 + ... + 714515.

It is an arithmetic number, because the mean of its divisors is an integer number (5001472).

Almost surely, 2^28579820 is an apocalyptic number.

28579820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28579820 is an abundant number, since it is smaller than the sum of its proper divisors (31437844).

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

28579820 is a wasteful number, since it uses less digits than its factorization.

28579820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1429000 (or 1428998 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 28579820 is about 5346.0097268898. The cubic root of 28579820 is about 305.7406348817.

The spelling of 28579820 in words is "twenty-eight million, five hundred seventy-nine thousand, eight hundred twenty".