28662880 has 24 divisors (see below), whose sum is σ = 67716432. Its totient is φ = 11465088.

The previous prime is 28662869. The next prime is 28662883. The reversal of 28662880 is 8826682.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28662883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89412 + ... + 89731.

It is an arithmetic number, because the mean of its divisors is an integer number (2821518).

Almost surely, 2^28662880 is an apocalyptic number.

28662880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28662880 is an abundant number, since it is smaller than the sum of its proper divisors (39053552).

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

28662880 is a wasteful number, since it uses less digits than its factorization.

28662880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179158 (or 179150 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 28662880 is about 5353.7725017038. The cubic root of 28662880 is about 306.0365342911.

The spelling of 28662880 in words is "twenty-eight million, six hundred sixty-two thousand, eight hundred eighty".