28206820 has 24 divisors (see below), whose sum is σ = 59572800. Its totient is φ = 11218272.

The previous prime is 28206797. The next prime is 28206877. The reversal of 28206820 is 2860282.

It is a happy number.

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, 360 + ... + 7519.

It is an arithmetic number, because the mean of its divisors is an integer number (2482200).

Almost surely, 2^28206820 is an apocalyptic number.

28206820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28206820 is an abundant number, since it is smaller than the sum of its proper divisors (31365980).

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

28206820 is a wasteful number, since it uses less digits than its factorization.

28206820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8067 (or 8065 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28206820 is about 5311.0093202705. The cubic root of 28206820 is about 304.4047154642.

The spelling of 28206820 in words is "twenty-eight million, two hundred six thousand, eight hundred twenty".