71238812836 has 27 divisors (see below), whose sum is σ = 125887535683. Its totient is φ = 35274296960.

The previous prime is 71238812807. The next prime is 71238812837. The reversal of 71238812836 is 63821883217.

The square root of 71238812836 is 266906.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 1783372900 + 69455439936 = 42230^2 + 263544^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71238812836.

It is not an unprimeable number, because it can be changed into a prime (71238812837) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 60320166 + ... + 60321346.

Almost surely, 2^71238812836 is an apocalyptic number.

71238812836 is the 266906-th square number.

It is an amenable number.

71238812836 is a deficient number, since it is larger than the sum of its proper divisors (54648722847).

71238812836 is an equidigital number, since it uses as much as digits as its factorization.

71238812836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592 (or 1296 counting only the distinct ones).

The product of its digits is 774144, while the sum is 49.

Multiplying 71238812836 by its sum of digits (49), we get a square (3490701828964 = 1868342²).

The spelling of 71238812836 in words is "seventy-one billion, two hundred thirty-eight million, eight hundred twelve thousand, eight hundred thirty-six".