28166320 has 160 divisors (see below), whose sum is σ = 83244672. Its totient is φ = 8626176.

The previous prime is 28166317. The next prime is 28166353. The reversal of 28166320 is 2366182.

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 385804 + ... + 385876.

Almost surely, 2^28166320 is an apocalyptic number.

28166320 is a gapful number since it is divisible by the number (20) 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 28166320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41622336).

28166320 is an abundant number, since it is smaller than the sum of its proper divisors (55078352).

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

28166320 is a wasteful number, since it uses less digits than its factorization.

28166320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 153 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 28166320 is about 5307.1951160665. The cubic root of 28166320 is about 304.2589552527.

The spelling of 28166320 in words is "twenty-eight million, one hundred sixty-six thousand, three hundred twenty".