28240656 has 20 divisors (see below), whose sum is σ = 72955152. Its totient is φ = 9413536.

The previous prime is 28240649. The next prime is 28240661. The reversal of 28240656 is 65604282.

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, 294126 + ... + 294221.

Almost surely, 2^28240656 is an apocalyptic number.

It is an amenable number.

28240656 is an abundant number, since it is smaller than the sum of its proper divisors (44714496).

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

28240656 is a wasteful number, since it uses less digits than its factorization.

28240656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588358 (or 588352 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 28240656 is about 5314.1938240903. The cubic root of 28240656 is about 304.5263848837.

The spelling of 28240656 in words is "twenty-eight million, two hundred forty thousand, six hundred fifty-six".