28166780 has 12 divisors (see below), whose sum is σ = 59150280. Its totient is φ = 11266704.

The previous prime is 28166767. The next prime is 28166783. The reversal of 28166780 is 8766182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28166783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704150 + ... + 704189.

It is an arithmetic number, because the mean of its divisors is an integer number (4929190).

Almost surely, 2^28166780 is an apocalyptic number.

28166780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28166780 is an abundant number, since it is smaller than the sum of its proper divisors (30983500).

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

28166780 is a wasteful number, since it uses less digits than its factorization.

28166780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408348 (or 1408346 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 28166780 is about 5307.2384532825. The cubic root of 28166780 is about 304.2606115850.

The spelling of 28166780 in words is "twenty-eight million, one hundred sixty-six thousand, seven hundred eighty".