28305530 has 48 divisors (see below), whose sum is σ = 56737800. Its totient is φ = 10158720.

The previous prime is 28305523. The next prime is 28305559. The reversal of 28305530 is 3550382.

It can be written as a sum of positive squares in 4 ways, for example, as 14070001 + 14235529 = 3751^2 + 3773^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28305530.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180212 + ... + 180368.

Almost surely, 2^28305530 is an apocalyptic number.

28305530 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

28305530 is a wasteful number, since it uses less digits than its factorization.

28305530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 26.

The square root of 28305530 is about 5320.2941647995. The cubic root of 28305530 is about 304.7593909957.

The spelling of 28305530 in words is "twenty-eight million, three hundred five thousand, five hundred thirty".