28415237 has 2 divisors, whose sum is σ = 28415238. Its totient is φ = 28415236.

The previous prime is 28415227. The next prime is 28415243. The reversal of 28415237 is 73251482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26977636 + 1437601 = 5194^2 + 1199^2 .

It is a cyclic number.

It is not a de Polignac number, because 28415237 - 2¹⁰ = 28414213 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28415207) 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, 14207618 + 14207619.

It is an arithmetic number, because the mean of its divisors is an integer number (14207619).

Almost surely, 2^28415237 is an apocalyptic number.

It is an amenable number.

28415237 is a deficient number, since it is larger than the sum of its proper divisors (1).

28415237 is an equidigital number, since it uses as much as digits as its factorization.

28415237 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 32.

The square root of 28415237 is about 5330.5944321436. The cubic root of 28415237 is about 305.1526137605.

The spelling of 28415237 in words is "twenty-eight million, four hundred fifteen thousand, two hundred thirty-seven".