28551287 has 2 divisors, whose sum is σ = 28551288. Its totient is φ = 28551286.

The previous prime is 28551247. The next prime is 28551323. The reversal of 28551287 is 78215582.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28551287 - 2⁶ = 28551223 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28551287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28551227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14275643 + 14275644.

It is an arithmetic number, because the mean of its divisors is an integer number (14275644).

Almost surely, 2^28551287 is an apocalyptic number.

28551287 is a deficient number, since it is larger than the sum of its proper divisors (1).

28551287 is an equidigital number, since it uses as much as digits as its factorization.

28551287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44800, while the sum is 38.

The square root of 28551287 is about 5343.3404345971. The cubic root of 28551287 is about 305.6388544147.

The spelling of 28551287 in words is "twenty-eight million, five hundred fifty-one thousand, two hundred eighty-seven".