28185695987 has 2 divisors, whose sum is σ = 28185695988. Its totient is φ = 28185695986.

The previous prime is 28185695983. The next prime is 28185696013. The reversal of 28185695987 is 78959658182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28185695987 - 2² = 28185695983 is a prime.

It is not a weakly prime, because it can be changed into another prime (28185695983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14092847993 + 14092847994.

It is an arithmetic number, because the mean of its divisors is an integer number (14092847994).

Almost surely, 2^28185695987 is an apocalyptic number.

28185695987 is a deficient number, since it is larger than the sum of its proper divisors (1).

28185695987 is an equidigital number, since it uses as much as digits as its factorization.

28185695987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87091200, while the sum is 68.

The spelling of 28185695987 in words is "twenty-eight billion, one hundred eighty-five million, six hundred ninety-five thousand, nine hundred eighty-seven".