28170280 has 64 divisors (see below), whose sum is σ = 65998800. Its totient is φ = 10813440.

The previous prime is 28170277. The next prime is 28170299. The reversal of 28170280 is 8207182.

It can be written as a sum of positive squares in 8 ways, for example, as 481636 + 27688644 = 694^2 + 5262^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145864 + ... + 146056.

Almost surely, 2^28170280 is an apocalyptic number.

28170280 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 28170280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32999400).

28170280 is an abundant number, since it is smaller than the sum of its proper divisors (37828520).

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

28170280 is a wasteful number, since it uses less digits than its factorization.

28170280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 330 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 28170280 is about 5307.5681813802. The cubic root of 28170280 is about 304.2732135229.

The spelling of 28170280 in words is "twenty-eight million, one hundred seventy thousand, two hundred eighty".