28025305 has 24 divisors (see below), whose sum is σ = 42681600. Its totient is φ = 17468640.

The previous prime is 28025303. The next prime is 28025311. The reversal of 28025305 is 50352082.

It is not a de Polignac number, because 28025305 - 2¹ = 28025303 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28025305.

It is not an unprimeable number, because it can be changed into a prime (28025303) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2505 + ... + 7894.

It is an arithmetic number, because the mean of its divisors is an integer number (1778400).

Almost surely, 2^28025305 is an apocalyptic number.

It is an amenable number.

28025305 is a deficient number, since it is larger than the sum of its proper divisors (14656295).

28025305 is a wasteful number, since it uses less digits than its factorization.

28025305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10429 (or 10422 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 28025305 is about 5293.8931798819. The cubic root of 28025305 is about 303.7503468867.

Adding to 28025305 its reverse (50352082), we get a palindrome (78377387).

The spelling of 28025305 in words is "twenty-eight million, twenty-five thousand, three hundred five".