28899820 has 24 divisors (see below), whose sum is σ = 61012224. Its totient is φ = 11498496.

The previous prime is 28899791. The next prime is 28899833. The reversal of 28899820 is 2899882.

It is a happy number.

It is a hoax number, since the sum of its digits (46) 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 7 ways as a sum of consecutive naturals, for example, 117 + ... + 7603.

It is an arithmetic number, because the mean of its divisors is an integer number (2542176).

Almost surely, 2^28899820 is an apocalyptic number.

28899820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28899820 is an abundant number, since it is smaller than the sum of its proper divisors (32112404).

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

28899820 is a wasteful number, since it uses less digits than its factorization.

28899820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7689 (or 7687 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 28899820 is about 5375.8552807902. The cubic root of 28899820 is about 306.8774988977.

The spelling of 28899820 in words is "twenty-eight million, eight hundred ninety-nine thousand, eight hundred twenty".