28878660 has 48 divisors (see below), whose sum is σ = 89846400. Its totient is φ = 7700832.

The previous prime is 28878659. The next prime is 28878667. The reversal of 28878660 is 6687882.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28878667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26200 + ... + 27279.

It is an arithmetic number, because the mean of its divisors is an integer number (1871800).

Almost surely, 2^28878660 is an apocalyptic number.

28878660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28878660 is an abundant number, since it is smaller than the sum of its proper divisors (60967740).

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

28878660 is a wasteful number, since it uses less digits than its factorization.

28878660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53497 (or 53489 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 28878660 is about 5373.8868614812. The cubic root of 28878660 is about 306.8025836290.

The spelling of 28878660 in words is "twenty-eight million, eight hundred seventy-eight thousand, six hundred sixty".