28785648 has 20 divisors (see below), whose sum is σ = 74363048. Its totient is φ = 9595200.

The previous prime is 28785629. The next prime is 28785683. The reversal of 28785648 is 84658782.

It is a super-2 number, since 2×28785648² = 1657227061559808, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 599701 = 28785648 / (2 + 8 + 7 + 8 + 5 + 6 + 4 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 28785597 and 28785606.

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, 299803 + ... + 299898.

Almost surely, 2^28785648 is an apocalyptic number.

It is an amenable number.

28785648 is an abundant number, since it is smaller than the sum of its proper divisors (45577400).

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

28785648 is a wasteful number, since it uses less digits than its factorization.

28785648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599712 (or 599706 counting only the distinct ones).

The product of its digits is 860160, while the sum is 48.

The square root of 28785648 is about 5365.2258107185. The cubic root of 28785648 is about 306.4728474927.

The spelling of 28785648 in words is "twenty-eight million, seven hundred eighty-five thousand, six hundred forty-eight".