71839892779 has 16 divisors (see below), whose sum is σ = 74047680000. Its totient is φ = 69662494944.

The previous prime is 71839892771. The next prime is 71839892819. The reversal of 71839892779 is 97729893817.

It is a cyclic number.

It is not a de Polignac number, because 71839892779 - 2³ = 71839892771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71839892771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3248949 + ... + 3270985.

It is an arithmetic number, because the mean of its divisors is an integer number (4627980000).

Almost surely, 2^71839892779 is an apocalyptic number.

71839892779 is a deficient number, since it is larger than the sum of its proper divisors (2207787221).

71839892779 is a wasteful number, since it uses less digits than its factorization.

71839892779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22722.

The product of its digits is 96018048, while the sum is 70.

The spelling of 71839892779 in words is "seventy-one billion, eight hundred thirty-nine million, eight hundred ninety-two thousand, seven hundred seventy-nine".