726643643 has 8 divisors (see below), whose sum is σ = 794914560. Its totient is φ = 658741480.

The previous prime is 726643639. The next prime is 726643661. The reversal of 726643643 is 346346627.

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 726643643 - 2² = 726643639 is a prime.

It is a super-2 number, since 2×726643643² = 1056021967824622898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 726643643.

It is not an unprimeable number, because it can be changed into a prime (726643693) 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, 88055 + ... + 95952.

It is an arithmetic number, because the mean of its divisors is an integer number (99364320).

Almost surely, 2^726643643 is an apocalyptic number.

726643643 is a deficient number, since it is larger than the sum of its proper divisors (68270917).

726643643 is a wasteful number, since it uses less digits than its factorization.

726643643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184377.

The product of its digits is 435456, while the sum is 41.

The square root of 726643643 is about 26956.3284406464. The cubic root of 726643643 is about 899.0292590956.

The spelling of 726643643 in words is "seven hundred twenty-six million, six hundred forty-three thousand, six hundred forty-three".