28804020 has 48 divisors (see below), whose sum is σ = 92174208. Its totient is φ = 6583680.

The previous prime is 28803979. The next prime is 28804031. The reversal of 28804020 is 2040882.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33871 + ... + 34710.

It is an arithmetic number, because the mean of its divisors is an integer number (1920296).

Almost surely, 2^28804020 is an apocalyptic number.

28804020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28804020 is an abundant number, since it is smaller than the sum of its proper divisors (63370188).

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

28804020 is a wasteful number, since it uses less digits than its factorization.

28804020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68600 (or 68598 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28804020 is about 5366.9376743167. The cubic root of 28804020 is about 306.5380341639.

The spelling of 28804020 in words is "twenty-eight million, eight hundred four thousand, twenty".