28171280 has 40 divisors (see below), whose sum is σ = 65751000. Its totient is φ = 11225088.

The previous prime is 28171277. The next prime is 28171291. The reversal of 28171280 is 8217182.

It can be written as a sum of positive squares in 4 ways, for example, as 3211264 + 24960016 = 1792^2 + 4996^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27416 + ... + 28424.

It is an arithmetic number, because the mean of its divisors is an integer number (1643775).

Almost surely, 2^28171280 is an apocalyptic number.

28171280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28171280 is an abundant number, since it is smaller than the sum of its proper divisors (37579720).

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

28171280 is a wasteful number, since it uses less digits than its factorization.

28171280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1371 (or 1365 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 28171280 is about 5307.6623856459. The cubic root of 28171280 is about 304.2768138848.

The spelling of 28171280 in words is "twenty-eight million, one hundred seventy-one thousand, two hundred eighty".