723720643 has 8 divisors (see below), whose sum is σ = 743586480. Its totient is φ = 703960320.

The previous prime is 723720631. The next prime is 723720709. The reversal of 723720643 is 346027327.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 723720643 - 2⁵ = 723720611 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 723720599 and 723720608.

It is not an unprimeable number, because it can be changed into a prime (723720623) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12373 + ... + 40006.

It is an arithmetic number, because the mean of its divisors is an integer number (92948310).

Almost surely, 2^723720643 is an apocalyptic number.

723720643 is a deficient number, since it is larger than the sum of its proper divisors (19865837).

723720643 is a wasteful number, since it uses less digits than its factorization.

723720643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52757.

The product of its (nonzero) digits is 42336, while the sum is 34.

The square root of 723720643 is about 26902.0564827301. The cubic root of 723720643 is about 897.8221593650.

The spelling of 723720643 in words is "seven hundred twenty-three million, seven hundred twenty thousand, six hundred forty-three".