28871280 has 60 divisors (see below), whose sum is σ = 96961800. Its totient is φ = 7698816.

The previous prime is 28871267. The next prime is 28871299. The reversal of 28871280 is 8217882.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19330 + ... + 20769.

It is an arithmetic number, because the mean of its divisors is an integer number (1616030).

Almost surely, 2^28871280 is an apocalyptic number.

28871280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28871280 is an abundant number, since it is smaller than the sum of its proper divisors (68090520).

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

28871280 is a wasteful number, since it uses less digits than its factorization.

28871280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40118 (or 40109 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 28871280 is about 5373.2001637758. The cubic root of 28871280 is about 306.7764467288.

The spelling of 28871280 in words is "twenty-eight million, eight hundred seventy-one thousand, two hundred eighty".