28166424 has 128 divisors (see below), whose sum is σ = 85881600. Its totient is φ = 7580160.

The previous prime is 28166407. The next prime is 28166447. The reversal of 28166424 is 42466182.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 99387 + ... + 99669.

It is an arithmetic number, because the mean of its divisors is an integer number (670950).

Almost surely, 2^28166424 is an apocalyptic number.

28166424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28166424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42940800).

28166424 is an abundant number, since it is smaller than the sum of its proper divisors (57715176).

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

28166424 is a wasteful number, since it uses less digits than its factorization.

28166424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345 (or 341 counting only the distinct ones).

The product of its digits is 18432, while the sum is 33.

The square root of 28166424 is about 5307.2049140767. The cubic root of 28166424 is about 304.2593297294.

The spelling of 28166424 in words is "twenty-eight million, one hundred sixty-six thousand, four hundred twenty-four".