28973820 has 24 divisors (see below), whose sum is σ = 81126864. Its totient is φ = 7726336.

The previous prime is 28973771. The next prime is 28973837. The reversal of 28973820 is 2837982.

It is a nialpdrome in base 12.

It is a congruent 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, 241389 + ... + 241508.

It is an arithmetic number, because the mean of its divisors is an integer number (3380286).

Almost surely, 2^28973820 is an apocalyptic number.

28973820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28973820 is an abundant number, since it is smaller than the sum of its proper divisors (52153044).

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

28973820 is a wasteful number, since it uses less digits than its factorization.

28973820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482909 (or 482907 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 28973820 is about 5382.7335063144. The cubic root of 28973820 is about 307.1392027173.

The spelling of 28973820 in words is "twenty-eight million, nine hundred seventy-three thousand, eight hundred twenty".