28456688 has 20 divisors (see below), whose sum is σ = 59376408. Its totient is φ = 13133760.

The previous prime is 28456651. The next prime is 28456717. The reversal of 28456688 is 88665482.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68198 + ... + 68613.

Almost surely, 2^28456688 is an apocalyptic number.

It is an amenable number.

28456688 is an abundant number, since it is smaller than the sum of its proper divisors (30919720).

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

28456688 is a wasteful number, since it uses less digits than its factorization.

28456688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136832 (or 136826 counting only the distinct ones).

The product of its digits is 737280, while the sum is 47.

The square root of 28456688 is about 5334.4810431756. The cubic root of 28456688 is about 305.3009231038.

The spelling of 28456688 in words is "twenty-eight million, four hundred fifty-six thousand, six hundred eighty-eight".