28912768 has 32 divisors (see below), whose sum is σ = 59593500. Its totient is φ = 13956096.

The previous prime is 28912729. The next prime is 28912781. The reversal of 28912768 is 86721982.

It can be written as a sum of positive squares in 2 ways, for example, as 28815424 + 97344 = 5368^2 + 312^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 183 + ... + 7606.

Almost surely, 2^28912768 is an apocalyptic number.

It is an amenable number.

28912768 is an abundant number, since it is smaller than the sum of its proper divisors (30680732).

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

28912768 is an equidigital number, since it uses as much as digits as its factorization.

28912768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7832 (or 7820 counting only the distinct ones).

The product of its digits is 96768, while the sum is 43.

The square root of 28912768 is about 5377.0594194225. The cubic root of 28912768 is about 306.9233222119.

The spelling of 28912768 in words is "twenty-eight million, nine hundred twelve thousand, seven hundred sixty-eight".