39722881636 has 27 divisors (see below), whose sum is σ = 69982037139. Its totient is φ = 19728902328.

The previous prime is 39722881633. The next prime is 39722881637. The reversal of 39722881636 is 63618822793.

The square root of 39722881636 is 199306.

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

39722881636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39722881633) 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, 90484705 + ... + 90485143.

Almost surely, 2^39722881636 is an apocalyptic number.

39722881636 is the 199306-th square number.

It is an amenable number.

39722881636 is a deficient number, since it is larger than the sum of its proper divisors (30259155503).

39722881636 is an frugal number, since it uses more digits than its factorization.

39722881636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336 (or 668 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 55.

It can be divided in two parts, 397228 and 81636, that added together give a square (478864 = 692²).

The spelling of 39722881636 in words is "thirty-nine billion, seven hundred twenty-two million, eight hundred eighty-one thousand, six hundred thirty-six".