726664678 has 8 divisors (see below), whose sum is σ = 1094885568. Its totient is φ = 361702824.

The previous prime is 726664661. The next prime is 726664723. The reversal of 726664678 is 876466627.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 814201 + ... + 815092.

It is an arithmetic number, because the mean of its divisors is an integer number (136860696).

Almost surely, 2^726664678 is an apocalyptic number.

726664678 is a deficient number, since it is larger than the sum of its proper divisors (368220890).

726664678 is a wasteful number, since it uses less digits than its factorization.

726664678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1629518.

The product of its digits is 4064256, while the sum is 52.

The square root of 726664678 is about 26956.7186059431. The cubic root of 726664678 is about 899.0379340944.

The spelling of 726664678 in words is "seven hundred twenty-six million, six hundred sixty-four thousand, six hundred seventy-eight".