79966987 has 2 divisors, whose sum is σ = 79966988. Its totient is φ = 79966986.

The previous prime is 79966973. The next prime is 79966993. The reversal of 79966987 is 78966997.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-79966987 is a prime.

It is not a weakly prime, because it can be changed into another prime (79966927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39983493 + 39983494.

It is an arithmetic number, because the mean of its divisors is an integer number (39983494).

Almost surely, 2^79966987 is an apocalyptic number.

79966987 is a deficient number, since it is larger than the sum of its proper divisors (1).

79966987 is an equidigital number, since it uses as much as digits as its factorization.

79966987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10287648, while the sum is 61.

The square root of 79966987 is about 8942.4262367659. The cubic root of 79966987 is about 430.8276595579.

The spelling of 79966987 in words is "seventy-nine million, nine hundred sixty-six thousand, nine hundred eighty-seven".