28256616 has 48 divisors (see below), whose sum is σ = 76773060. Its totient is φ = 9388800.

The previous prime is 28256563. The next prime is 28256623. The reversal of 28256616 is 61665282.

28256616 is a `hidden beast` number, since 2 + 82 + 566 + 16 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 28196100 + 60516 = 5310^2 + 246^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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 11 ways as a sum of consecutive naturals, for example, 42946 + ... + 43598.

Almost surely, 2^28256616 is an apocalyptic number.

It is an amenable number.

28256616 is an abundant number, since it is smaller than the sum of its proper divisors (48516444).

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

28256616 is a wasteful number, since it uses less digits than its factorization.

28256616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1259 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 28256616 is about 5315.6952508585. The cubic root of 28256616 is about 304.5837410326.

The spelling of 28256616 in words is "twenty-eight million, two hundred fifty-six thousand, six hundred sixteen".