71978739807 has 24 divisors (see below), whose sum is σ = 103984590864. Its totient is φ = 44267917824.

The previous prime is 71978739797. The next prime is 71978739817. The reversal of 71978739807 is 70893787917.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (71978739797) and next prime (71978739817).

It is not a de Polignac number, because 71978739807 - 2⁶ = 71978739743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71978739817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 816423 + ... + 900279.

It is an arithmetic number, because the mean of its divisors is an integer number (4332691286).

Almost surely, 2^71978739807 is an apocalyptic number.

71978739807 is a deficient number, since it is larger than the sum of its proper divisors (32005851057).

71978739807 is a wasteful number, since it uses less digits than its factorization.

71978739807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85579 (or 85566 counting only the distinct ones).

The product of its (nonzero) digits is 37340352, while the sum is 66.

The spelling of 71978739807 in words is "seventy-one billion, nine hundred seventy-eight million, seven hundred thirty-nine thousand, eight hundred seven".