28866620 has 12 divisors (see below), whose sum is σ = 60619944. Its totient is φ = 11546640.

The previous prime is 28866599. The next prime is 28866637. The reversal of 28866620 is 2666882.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721646 + ... + 721685.

It is an arithmetic number, because the mean of its divisors is an integer number (5051662).

Almost surely, 2^28866620 is an apocalyptic number.

28866620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28866620 is an abundant number, since it is smaller than the sum of its proper divisors (31753324).

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

28866620 is a wasteful number, since it uses less digits than its factorization.

28866620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1443340 (or 1443338 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 38.

The square root of 28866620 is about 5372.7665127009. The cubic root of 28866620 is about 306.7599406466.

The spelling of 28866620 in words is "twenty-eight million, eight hundred sixty-six thousand, six hundred twenty".