71940643904 has 14 divisors (see below), whose sum is σ = 142757215374. Its totient is φ = 35970321920.

The previous prime is 71940643889. The next prime is 71940643927. The reversal of 71940643904 is 40934604917.

It can be written as a sum of positive squares in only one way, i.e., 41189514304 + 30751129600 = 202952^2 + 175360^2 .

It is a super-2 number, since 2×71940643904² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 562036217 + ... + 562036344.

Almost surely, 2^71940643904 is an apocalyptic number.

It is an amenable number.

71940643904 is a deficient number, since it is larger than the sum of its proper divisors (70816571470).

71940643904 is a wasteful number, since it uses less digits than its factorization.

71940643904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124072573 (or 1124072563 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 71940643904 in words is "seventy-one billion, nine hundred forty million, six hundred forty-three thousand, nine hundred four".