8722081642 has 8 divisors (see below), whose sum is σ = 13852717956. Its totient is φ = 4104508992.

The previous prime is 8722081639. The next prime is 8722081649. The reversal of 8722081642 is 2461802278.

It can be written as a sum of positive squares in 2 ways, for example, as 8425587681 + 296493961 = 91791^2 + 17219^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 8722081595 and 8722081604.

It is not an unprimeable number, because it can be changed into a prime (8722081649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 128265873 + ... + 128265940.

Almost surely, 2^8722081642 is an apocalyptic number.

8722081642 is a deficient number, since it is larger than the sum of its proper divisors (5130636314).

8722081642 is a wasteful number, since it uses less digits than its factorization.

8722081642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256531832.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 8722081642 is about 93392.0855426197. The cubic root of 8722081642 is about 2058.4487049881.

The spelling of 8722081642 in words is "eight billion, seven hundred twenty-two million, eighty-one thousand, six hundred forty-two".