28315237 has 2 divisors, whose sum is σ = 28315238. Its totient is φ = 28315236.

The previous prime is 28315229. The next prime is 28315241. The reversal of 28315237 is 73251382.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19351201 + 8964036 = 4399^2 + 2994^2 .

It is a cyclic number.

It is not a de Polignac number, because 28315237 - 2³ = 28315229 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28315199 and 28315208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28315207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14157618 + 14157619.

It is an arithmetic number, because the mean of its divisors is an integer number (14157619).

Almost surely, 2^28315237 is an apocalyptic number.

It is an amenable number.

28315237 is a deficient number, since it is larger than the sum of its proper divisors (1).

28315237 is an equidigital number, since it uses as much as digits as its factorization.

28315237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 31.

The square root of 28315237 is about 5321.2063481884. The cubic root of 28315237 is about 304.7942247225.

The spelling of 28315237 in words is "twenty-eight million, three hundred fifteen thousand, two hundred thirty-seven".