28615288 has 16 divisors (see below), whose sum is σ = 57781080. Its totient is φ = 13207008.

The previous prime is 28615277. The next prime is 28615297. The reversal of 28615288 is 88251682.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 28615288.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137470 + ... + 137677.

Almost surely, 2^28615288 is an apocalyptic number.

It is an amenable number.

28615288 is an abundant number, since it is smaller than the sum of its proper divisors (29165792).

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

28615288 is a wasteful number, since it uses less digits than its factorization.

28615288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275166 (or 275162 counting only the distinct ones).

The product of its digits is 61440, while the sum is 40.

The square root of 28615288 is about 5349.3259388450. The cubic root of 28615288 is about 305.8670588884.

The spelling of 28615288 in words is "twenty-eight million, six hundred fifteen thousand, two hundred eighty-eight".