79987966 has 8 divisors (see below), whose sum is σ = 122908464. Its totient is φ = 39018480.

The previous prime is 79987939. The next prime is 79987981. The reversal of 79987966 is 66978997.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 487650 + ... + 487813.

It is an arithmetic number, because the mean of its divisors is an integer number (15363558).

Almost surely, 2^79987966 is an apocalyptic number.

79987966 is a deficient number, since it is larger than the sum of its proper divisors (42920498).

79987966 is a wasteful number, since it uses less digits than its factorization.

79987966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975506.

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

The square root of 79987966 is about 8943.5991636477. The cubic root of 79987966 is about 430.8653315337.

The spelling of 79987966 in words is "seventy-nine million, nine hundred eighty-seven thousand, nine hundred sixty-six".