28831820 has 12 divisors (see below), whose sum is σ = 60546864. Its totient is φ = 11532720.

The previous prime is 28831819. The next prime is 28831849. The reversal of 28831820 is 2813882.

It is a hoax number, since the sum of its digits (32) 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, 720776 + ... + 720815.

It is an arithmetic number, because the mean of its divisors is an integer number (5045572).

Almost surely, 2^28831820 is an apocalyptic number.

28831820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28831820 is an abundant number, since it is smaller than the sum of its proper divisors (31715044).

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

28831820 is a wasteful number, since it uses less digits than its factorization.

28831820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441600 (or 1441598 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 28831820 is about 5369.5269810291. The cubic root of 28831820 is about 306.6366201396.

The spelling of 28831820 in words is "twenty-eight million, eight hundred thirty-one thousand, eight hundred twenty".