79909967 has 4 divisors (see below), whose sum is σ = 79934976. Its totient is φ = 79884960.

The previous prime is 79909957. The next prime is 79909969. The reversal of 79909967 is 76990997.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76990997 = 797 ⋅96601.

It is a cyclic number.

It is not a de Polignac number, because 79909967 - 2⁶ = 79909903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79909969) by changing a digit.

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, 6863 + ... + 14384.

It is an arithmetic number, because the mean of its divisors is an integer number (19983744).

Almost surely, 2^79909967 is an apocalyptic number.

79909967 is a deficient number, since it is larger than the sum of its proper divisors (25009).

79909967 is a wasteful number, since it uses less digits than its factorization.

79909967 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25008.

The product of its (nonzero) digits is 1928934, while the sum is 56.

The square root of 79909967 is about 8939.2374954467. The cubic root of 79909967 is about 430.7252354818.

The spelling of 79909967 in words is "seventy-nine million, nine hundred nine thousand, nine hundred sixty-seven".