71493211940 has 12 divisors (see below), whose sum is σ = 150135745116. Its totient is φ = 28597284768.

The previous prime is 71493211939. The next prime is 71493211961. The reversal of 71493211940 is 4911239417.

It can be written as a sum of positive squares in 2 ways, for example, as 20102135524 + 51391076416 = 141782^2 + 226696^2 .

It is a super-2 number, since 2×71493211940² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1787330279 + ... + 1787330318.

It is an arithmetic number, because the mean of its divisors is an integer number (12511312093).

Almost surely, 2^71493211940 is an apocalyptic number.

It is an amenable number.

71493211940 is an abundant number, since it is smaller than the sum of its proper divisors (78642533176).

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

71493211940 is a wasteful number, since it uses less digits than its factorization.

71493211940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3574660606 (or 3574660604 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 41.

The spelling of 71493211940 in words is "seventy-one billion, four hundred ninety-three million, two hundred eleven thousand, nine hundred forty".