28305256 has 32 divisors (see below), whose sum is σ = 60912000. Its totient is φ = 12079296.

The previous prime is 28305227. The next prime is 28305313. The reversal of 28305256 is 65250382.

It is a happy number.

It is a super-3 number, since 3×28305256³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14125 + ... + 16003.

It is an arithmetic number, because the mean of its divisors is an integer number (1903500).

Almost surely, 2^28305256 is an apocalyptic number.

It is an amenable number.

28305256 is an abundant number, since it is smaller than the sum of its proper divisors (32606744).

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

28305256 is a wasteful number, since it uses less digits than its factorization.

28305256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2161 (or 2157 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 28305256 is about 5320.2684142814. The cubic root of 28305256 is about 304.7584076267.

It can be divided in two parts, 28305 and 256, that added together give a 4-th power (28561 = 13⁴).

The spelling of 28305256 in words is "twenty-eight million, three hundred five thousand, two hundred fifty-six".