76720979 has 4 divisors (see below), whose sum is σ = 79366560. Its totient is φ = 74075400.

The previous prime is 76720961. The next prime is 76720997. The reversal of 76720979 is 97902767.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97902767 = 229 ⋅427523.

It is an interprime number because it is at equal distance from previous prime (76720961) and next prime (76720997).

It is a cyclic number.

It is not a de Polignac number, because 76720979 - 2²⁰ = 75672403 is a prime.

It is a super-2 number, since 2×76720979² = 11772217237436882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76720379) 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, 1322747 + ... + 1322804.

It is an arithmetic number, because the mean of its divisors is an integer number (19841640).

Almost surely, 2^76720979 is an apocalyptic number.

76720979 is a deficient number, since it is larger than the sum of its proper divisors (2645581).

76720979 is a wasteful number, since it uses less digits than its factorization.

76720979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2645580.

The product of its (nonzero) digits is 333396, while the sum is 47.

The square root of 76720979 is about 8759.0512614095. The cubic root of 76720979 is about 424.9175923266.

The spelling of 76720979 in words is "seventy-six million, seven hundred twenty thousand, nine hundred seventy-nine".