28878688 has 36 divisors (see below), whose sum is σ = 57987468. Its totient is φ = 14156480.

The previous prime is 28878683. The next prime is 28878749. The reversal of 28878688 is 88687882.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28878683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 220383 + ... + 220513.

It is an arithmetic number, because the mean of its divisors is an integer number (1610763).

Almost surely, 2^28878688 is an apocalyptic number.

It is an amenable number.

28878688 is an abundant number, since it is smaller than the sum of its proper divisors (29108780).

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

28878688 is an equidigital number, since it uses as much as digits as its factorization.

28878688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 216 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 55.

The square root of 28878688 is about 5373.8894666712. The cubic root of 28878688 is about 306.8026827849.

The spelling of 28878688 in words is "twenty-eight million, eight hundred seventy-eight thousand, six hundred eighty-eight".