71940639156 has 24 divisors (see below), whose sum is σ = 169523489184. Its totient is φ = 23742784800.

The previous prime is 71940639143. The next prime is 71940639157. The reversal of 71940639156 is 65193604917.

It is a junction number, because it is equal to n+sod(n) for n = 71940639099 and 71940639108.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71940639157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29677270 + ... + 29679693.

It is an arithmetic number, because the mean of its divisors is an integer number (7063478716).

Almost surely, 2^71940639156 is an apocalyptic number.

It is an amenable number.

71940639156 is an abundant number, since it is smaller than the sum of its proper divisors (97582850028).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71940639156 is a wasteful number, since it uses less digits than its factorization.

71940639156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59357071 (or 59357069 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 51.

The spelling of 71940639156 in words is "seventy-one billion, nine hundred forty million, six hundred thirty-nine thousand, one hundred fifty-six".