28831687 has 2 divisors, whose sum is σ = 28831688. Its totient is φ = 28831686.

The previous prime is 28831681. The next prime is 28831697. The reversal of 28831687 is 78613882.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28831687 - 2¹¹ = 28829639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28831681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14415843 + 14415844.

It is an arithmetic number, because the mean of its divisors is an integer number (14415844).

Almost surely, 2^28831687 is an apocalyptic number.

28831687 is a deficient number, since it is larger than the sum of its proper divisors (1).

28831687 is an equidigital number, since it uses as much as digits as its factorization.

28831687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 129024, while the sum is 43.

The square root of 28831687 is about 5369.5145963113. The cubic root of 28831687 is about 306.6361486382.

The spelling of 28831687 in words is "twenty-eight million, eight hundred thirty-one thousand, six hundred eighty-seven".