71720197776 has 60 divisors (see below), whose sum is σ = 201402101628. Its totient is φ = 23825125632.

The previous prime is 71720197753. The next prime is 71720197789. The reversal of 71720197776 is 67779102717.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 55686560400 + 16033637376 = 235980^2 + 126624^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 807735 + ... + 892118.

Almost surely, 2^71720197776 is an apocalyptic number.

It is an amenable number.

71720197776 is an abundant number, since it is smaller than the sum of its proper divisors (129681903852).

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

71720197776 is a wasteful number, since it uses less digits than its factorization.

71720197776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700160 (or 1700151 counting only the distinct ones).

The product of its (nonzero) digits is 1815156, while the sum is 54.

The spelling of 71720197776 in words is "seventy-one billion, seven hundred twenty million, one hundred ninety-seven thousand, seven hundred seventy-six".