722706643 has 4 divisors (see below), whose sum is σ = 732606808. Its totient is φ = 712806480.

The previous prime is 722706637. The next prime is 722706653. The reversal of 722706643 is 346607227.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 722706643 - 2¹³ = 722698451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (722706623) 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, 4949973 + ... + 4950118.

It is an arithmetic number, because the mean of its divisors is an integer number (183151702).

Almost surely, 2^722706643 is an apocalyptic number.

722706643 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

722706643 is a deficient number, since it is larger than the sum of its proper divisors (9900165).

722706643 is an equidigital number, since it uses as much as digits as its factorization.

722706643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9900164.

The product of its (nonzero) digits is 84672, while the sum is 37.

The square root of 722706643 is about 26883.2037339302. The cubic root of 722706643 is about 897.4026525701.

The spelling of 722706643 in words is "seven hundred twenty-two million, seven hundred six thousand, six hundred forty-three".