726668638 has 16 divisors (see below), whose sum is σ = 1154903184. Its totient is φ = 341729920.

The previous prime is 726668629. The next prime is 726668669. The reversal of 726668638 is 836866627.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50268 + ... + 63088.

It is an arithmetic number, because the mean of its divisors is an integer number (72181449).

Almost surely, 2^726668638 is an apocalyptic number.

726668638 is a deficient number, since it is larger than the sum of its proper divisors (428234546).

726668638 is a wasteful number, since it uses less digits than its factorization.

726668638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14507.

The product of its digits is 3483648, while the sum is 52.

The square root of 726668638 is about 26956.7920569195. The cubic root of 726668638 is about 899.0395672106.

The spelling of 726668638 in words is "seven hundred twenty-six million, six hundred sixty-eight thousand, six hundred thirty-eight".