28879872 has 176 divisors, whose sum is σ = 94325760. Its totient is φ = 7667712.

The previous prime is 28879847. The next prime is 28879883. The reversal of 28879872 is 27897882.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

Its product of digits (903168) is a multiple of the sum of its prime factors (126).

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, 365529 + ... + 365607.

Almost surely, 2^28879872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28879872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47162880).

28879872 is an abundant number, since it is smaller than the sum of its proper divisors (65445888).

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

28879872 is a wasteful number, since it uses less digits than its factorization.

28879872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126 (or 108 counting only the distinct ones).

The product of its digits is 903168, while the sum is 51.

The square root of 28879872 is about 5373.9996278377. Note that the first 3 decimals coincide. The cubic root of 28879872 is about 306.8068756048.

The spelling of 28879872 in words is "twenty-eight million, eight hundred seventy-nine thousand, eight hundred seventy-two".