28706880 has 112 divisors (see below), whose sum is σ = 96560640. Its totient is φ = 7200768.

The previous prime is 28706879. The next prime is 28706893. The reversal of 28706880 is 8860782.

It is a congruent number.

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, 15441 + ... + 17199.

Almost surely, 2^28706880 is an apocalyptic number.

28706880 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 28706880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48280320).

28706880 is an abundant number, since it is smaller than the sum of its proper divisors (67853760).

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

28706880 is a wasteful number, since it uses less digits than its factorization.

28706880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 28706880 is about 5357.8801778315. The cubic root of 28706880 is about 306.1930517461.

The spelling of 28706880 in words is "twenty-eight million, seven hundred six thousand, eight hundred eighty".