71772731792 has 10 divisors (see below), whose sum is σ = 139059667878. Its totient is φ = 35886365888.

The previous prime is 71772731791. The next prime is 71772731813. The reversal of 71772731792 is 29713727717.

It can be written as a sum of positive squares in only one way, i.e., 37003908496 + 34768823296 = 192364^2 + 186464^2 .

It is not an unprimeable number, because it can be changed into a prime (71772731791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2242897853 + ... + 2242897884.

Almost surely, 2^71772731792 is an apocalyptic number.

It is an amenable number.

71772731792 is a deficient number, since it is larger than the sum of its proper divisors (67286936086).

71772731792 is a wasteful number, since it uses less digits than its factorization.

71772731792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4485795745 (or 4485795739 counting only the distinct ones).

The product of its digits is 1815156, while the sum is 53.

The spelling of 71772731792 in words is "seventy-one billion, seven hundred seventy-two million, seven hundred thirty-one thousand, seven hundred ninety-two".