28173380 has 12 divisors (see below), whose sum is σ = 59164140. Its totient is φ = 11269344.

The previous prime is 28173373. The next prime is 28173407. The reversal of 28173380 is 8337182.

It can be written as a sum of positive squares in 2 ways, for example, as 14394436 + 13778944 = 3794^2 + 3712^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 704315 + ... + 704354.

It is an arithmetic number, because the mean of its divisors is an integer number (4930345).

Almost surely, 2^28173380 is an apocalyptic number.

28173380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28173380 is an abundant number, since it is smaller than the sum of its proper divisors (30990760).

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

28173380 is a wasteful number, since it uses less digits than its factorization.

28173380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1408678 (or 1408676 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 28173380 is about 5307.8602091615. The cubic root of 28173380 is about 304.2843743676.

The spelling of 28173380 in words is "twenty-eight million, one hundred seventy-three thousand, three hundred eighty".