28305756 has 18 divisors (see below), whose sum is σ = 71550752. Its totient is φ = 9435240.

The previous prime is 28305751. The next prime is 28305757. The reversal of 28305756 is 65750382.

28305756 is a `hidden beast` number, since 2 + 83 + 0 + 575 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 786271 = 28305756 / (2 + 8 + 3 + 0 + 5 + 7 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 28305756.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28305751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 393100 + ... + 393171.

Almost surely, 2^28305756 is an apocalyptic number.

It is an amenable number.

28305756 is an abundant number, since it is smaller than the sum of its proper divisors (43244996).

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

28305756 is a wasteful number, since it uses less digits than its factorization.

28305756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 786281 (or 786276 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 36.

The square root of 28305756 is about 5320.3154041842. The cubic root of 28305756 is about 304.7602020909.

The spelling of 28305756 in words is "twenty-eight million, three hundred five thousand, seven hundred fifty-six".