71898779 has 2 divisors, whose sum is σ = 71898780. Its totient is φ = 71898778.

The previous prime is 71898737. The next prime is 71898781. The reversal of 71898779 is 97789817.

It is a strong prime.

It is an emirp because it is prime and its reverse (97789817) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71898779 - 2⁸ = 71898523 is a prime.

It is a Sophie Germain prime.

Together with 71898781, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (71898719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35949389 + 35949390.

It is an arithmetic number, because the mean of its divisors is an integer number (35949390).

Almost surely, 2^71898779 is an apocalyptic number.

71898779 is a deficient number, since it is larger than the sum of its proper divisors (1).

71898779 is an equidigital number, since it uses as much as digits as its factorization.

71898779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1778112, while the sum is 56.

The square root of 71898779 is about 8479.3147718433. The cubic root of 71898779 is about 415.8217211771.

The spelling of 71898779 in words is "seventy-one million, eight hundred ninety-eight thousand, seven hundred seventy-nine".