28300257 has 12 divisors (see below), whose sum is σ = 43282980. Its totient is φ = 17756928.

The previous prime is 28300247. The next prime is 28300267. The reversal of 28300257 is 75200382.

It is an interprime number because it is at equal distance from previous prime (28300247) and next prime (28300267).

It can be written as a sum of positive squares in 2 ways, for example, as 21123216 + 7177041 = 4596^2 + 2679^2 .

It is not a de Polignac number, because 28300257 - 2⁸ = 28300001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28300257.

It is not an unprimeable number, because it can be changed into a prime (28300247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92332 + ... + 92637.

It is an arithmetic number, because the mean of its divisors is an integer number (3606915).

Almost surely, 2^28300257 is an apocalyptic number.

It is an amenable number.

28300257 is a deficient number, since it is larger than the sum of its proper divisors (14982723).

28300257 is a wasteful number, since it uses less digits than its factorization.

28300257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184992 (or 184989 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 28300257 is about 5319.7985864128. The cubic root of 28300257 is about 304.7404654115.

The spelling of 28300257 in words is "twenty-eight million, three hundred thousand, two hundred fifty-seven".