28728896 has 42 divisors (see below), whose sum is σ = 66323718. Its totient is φ = 12311040.

The previous prime is 28728881. The next prime is 28728911. The reversal of 28728896 is 69882782.

It is an interprime number because it is at equal distance from previous prime (28728881) and next prime (28728911).

It can be written as a sum of positive squares in only one way, i.e., 22657600 + 6071296 = 4760^2 + 2464^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1445 + ... + 7716.

Almost surely, 2^28728896 is an apocalyptic number.

It is an amenable number.

28728896 is an abundant number, since it is smaller than the sum of its proper divisors (37594822).

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

28728896 is an equidigital number, since it uses as much as digits as its factorization.

28728896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9187 (or 9170 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The square root of 28728896 is about 5359.9343279559. The cubic root of 28728896 is about 306.2713073610.

The spelling of 28728896 in words is "twenty-eight million, seven hundred twenty-eight thousand, eight hundred ninety-six".