28782928 has 20 divisors (see below), whose sum is σ = 55912468. Its totient is φ = 14353920.

The previous prime is 28782917. The next prime is 28782947. The reversal of 28782928 is 82928782.

It can be written as a sum of positive squares in 2 ways, for example, as 2650384 + 26132544 = 1628^2 + 5112^2 .

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, 4600 + ... + 8872.

Almost surely, 2^28782928 is an apocalyptic number.

It is an amenable number.

28782928 is a deficient number, since it is larger than the sum of its proper divisors (27129540).

28782928 is a wasteful number, since it uses less digits than its factorization.

28782928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4702 (or 4696 counting only the distinct ones).

The product of its digits is 258048, while the sum is 46.

The square root of 28782928 is about 5364.9723205251. The cubic root of 28782928 is about 306.4631941589.

The spelling of 28782928 in words is "twenty-eight million, seven hundred eighty-two thousand, nine hundred twenty-eight".