71958979 has 4 divisors (see below), whose sum is σ = 72038880. Its totient is φ = 71879080.

The previous prime is 71958961. The next prime is 71959003. The reversal of 71958979 is 97985917.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97985917 = 6091 ⋅16087.

It is a cyclic number.

It is not a de Polignac number, because 71958979 - 2⁷ = 71958851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71958919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38584 + ... + 40405.

It is an arithmetic number, because the mean of its divisors is an integer number (18009720).

Almost surely, 2^71958979 is an apocalyptic number.

71958979 is a deficient number, since it is larger than the sum of its proper divisors (79901).

71958979 is an equidigital number, since it uses as much as digits as its factorization.

71958979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79900.

The product of its digits is 1428840, while the sum is 55.

The square root of 71958979 is about 8482.8638442451. The cubic root of 71958979 is about 415.9377430101.

The spelling of 71958979 in words is "seventy-one million, nine hundred fifty-eight thousand, nine hundred seventy-nine".