28305525 has 48 divisors (see below), whose sum is σ = 49818240. Its totient is φ = 14150400.

The previous prime is 28305523. The next prime is 28305559. The reversal of 28305525 is 52550382.

It is not a de Polignac number, because 28305525 - 2¹ = 28305523 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28305492 and 28305501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28305523) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 105091 + ... + 105359.

It is an arithmetic number, because the mean of its divisors is an integer number (1037880).

Almost surely, 2^28305525 is an apocalyptic number.

28305525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28305525 is a deficient number, since it is larger than the sum of its proper divisors (21512715).

28305525 is a wasteful number, since it uses less digits than its factorization.

28305525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 28305525 is about 5320.2936949007. The cubic root of 28305525 is about 304.7593730510.

The spelling of 28305525 in words is "twenty-eight million, three hundred five thousand, five hundred twenty-five".