28256680 has 16 divisors (see below), whose sum is σ = 63577620. Its totient is φ = 11302656.

The previous prime is 28256677. The next prime is 28256687. The reversal of 28256680 is 8665282.

It can be written as a sum of positive squares in 2 ways, for example, as 27520516 + 736164 = 5246^2 + 858^2 .

It is not an unprimeable number, because it can be changed into a prime (28256687) by changing a digit.

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, 353169 + ... + 353248.

Almost surely, 2^28256680 is an apocalyptic number.

28256680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28256680 is an abundant number, since it is smaller than the sum of its proper divisors (35320940).

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

28256680 is a wasteful number, since it uses less digits than its factorization.

28256680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706428 (or 706424 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 28256680 is about 5315.7012707638. The cubic root of 28256680 is about 304.5839709887.

The spelling of 28256680 in words is "twenty-eight million, two hundred fifty-six thousand, six hundred eighty".