71391009736 has 8 divisors (see below), whose sum is σ = 133858143270. Its totient is φ = 35695504864.

The previous prime is 71391009731. The next prime is 71391009761. The reversal of 71391009736 is 63790019317.

It can be written as a sum of positive squares in only one way, i.e., 55842416100 + 15548593636 = 236310^2 + 124694^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×71391009736² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71391009731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4461938101 + ... + 4461938116.

Almost surely, 2^71391009736 is an apocalyptic number.

It is an amenable number.

71391009736 is a deficient number, since it is larger than the sum of its proper divisors (62467133534).

71391009736 is a wasteful number, since it uses less digits than its factorization.

71391009736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8923876223 (or 8923876219 counting only the distinct ones).

The product of its (nonzero) digits is 214326, while the sum is 46.

The spelling of 71391009736 in words is "seventy-one billion, three hundred ninety-one million, nine thousand, seven hundred thirty-six".