23887987987 has 2 divisors, whose sum is σ = 23887987988. Its totient is φ = 23887987986.

The previous prime is 23887987919. The next prime is 23887987999. The reversal of 23887987987 is 78978978832.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 23887987987 - 2²³ = 23879599379 is a prime.

It is not a weakly prime, because it can be changed into another prime (23887987187) 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, 11943993993 + 11943993994.

It is an arithmetic number, because the mean of its divisors is an integer number (11943993994).

Almost surely, 2^23887987987 is an apocalyptic number.

23887987987 is a deficient number, since it is larger than the sum of its proper divisors (1).

23887987987 is an equidigital number, since it uses as much as digits as its factorization.

23887987987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 682795008, while the sum is 76.

The spelling of 23887987987 in words is "twenty-three billion, eight hundred eighty-seven million, nine hundred eighty-seven thousand, nine hundred eighty-seven".