28688166 has 24 divisors (see below), whose sum is σ = 66939600. Its totient is φ = 8827056.

The previous prime is 28688123. The next prime is 28688167. The reversal of 28688166 is 66188682.

28688166 = 32⁴ + 33⁴ + ... + 44⁴.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28688167) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 61066 + ... + 61533.

It is an arithmetic number, because the mean of its divisors is an integer number (2789150).

Almost surely, 2^28688166 is an apocalyptic number.

28688166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28688166 is an abundant number, since it is smaller than the sum of its proper divisors (38251434).

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

28688166 is a wasteful number, since it uses less digits than its factorization.

28688166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122620 (or 122617 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 28688166 is about 5356.1334934820. The cubic root of 28688166 is about 306.1265015861.

The spelling of 28688166 in words is "twenty-eight million, six hundred eighty-eight thousand, one hundred sixty-six".