28937287 has 2 divisors, whose sum is σ = 28937288. Its totient is φ = 28937286.

The previous prime is 28937269. The next prime is 28937297. The reversal of 28937287 is 78273982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28937287 - 2²³ = 20548679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28937297) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14468643 + 14468644.

It is an arithmetic number, because the mean of its divisors is an integer number (14468644).

Almost surely, 2^28937287 is an apocalyptic number.

28937287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28937287 is an equidigital number, since it uses as much as digits as its factorization.

28937287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The square root of 28937287 is about 5379.3388999021. The cubic root of 28937287 is about 307.0100581326.

The spelling of 28937287 in words is "twenty-eight million, nine hundred thirty-seven thousand, two hundred eighty-seven".