87816979 has 2 divisors, whose sum is σ = 87816980. Its totient is φ = 87816978.

The previous prime is 87816977. The next prime is 87817057. The reversal of 87816979 is 97961878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87816979 - 2¹ = 87816977 is a prime.

Together with 87816977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (87816973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43908489 + 43908490.

It is an arithmetic number, because the mean of its divisors is an integer number (43908490).

Almost surely, 2^87816979 is an apocalyptic number.

87816979 is a deficient number, since it is larger than the sum of its proper divisors (1).

87816979 is an equidigital number, since it uses as much as digits as its factorization.

87816979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 55.

The square root of 87816979 is about 9371.0713901880. The cubic root of 87816979 is about 444.4874441985.

The spelling of 87816979 in words is "eighty-seven million, eight hundred sixteen thousand, nine hundred seventy-nine".