71977679 has 2 divisors, whose sum is σ = 71977680. Its totient is φ = 71977678.

The previous prime is 71977669. The next prime is 71977687. The reversal of 71977679 is 97677917.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71977679 - 2²⁴ = 55200463 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 71977679.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71977669) 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 as a sum of consecutive naturals, namely, 35988839 + 35988840.

It is an arithmetic number, because the mean of its divisors is an integer number (35988840).

Almost surely, 2^71977679 is an apocalyptic number.

71977679 is a deficient number, since it is larger than the sum of its proper divisors (1).

71977679 is an equidigital number, since it uses as much as digits as its factorization.

71977679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166886, while the sum is 53.

The square root of 71977679 is about 8483.9659947456. The cubic root of 71977679 is about 415.9737698421.

The spelling of 71977679 in words is "seventy-one million, nine hundred seventy-seven thousand, six hundred seventy-nine".