28538880 has 96 divisors (see below), whose sum is σ = 91400400. Its totient is φ = 7602176.

The previous prime is 28538843. The next prime is 28538891. The reversal of 28538880 is 8883582.

It is a tau number, because it is divible by the number of its divisors (96).

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, 30256 + ... + 31184.

Almost surely, 2^28538880 is an apocalyptic number.

28538880 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 28538880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45700200).

28538880 is an abundant number, since it is smaller than the sum of its proper divisors (62861520).

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

28538880 is an equidigital number, since it uses as much as digits as its factorization.

28538880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959 (or 939 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 42.

The square root of 28538880 is about 5342.1793305729. The cubic root of 28538880 is about 305.5945760758.

The spelling of 28538880 in words is "twenty-eight million, five hundred thirty-eight thousand, eight hundred eighty".