726664420 has 24 divisors (see below), whose sum is σ = 1533672000. Its totient is φ = 289203552.

The previous prime is 726664333. The next prime is 726664429. The reversal of 726664420 is 24466627.

It is a self number, because there is not a number n which added to its sum of digits gives 726664420.

It is not an unprimeable number, because it can be changed into a prime (726664429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87310 + ... + 95269.

It is an arithmetic number, because the mean of its divisors is an integer number (63903000).

Almost surely, 2^726664420 is an apocalyptic number.

It is an amenable number.

726664420 is an abundant number, since it is smaller than the sum of its proper divisors (807007580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

726664420 is a wasteful number, since it uses less digits than its factorization.

726664420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182787 (or 182785 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 726664420 is about 26956.7138204938. The cubic root of 726664420 is about 899.0378276941.

The spelling of 726664420 in words is "seven hundred twenty-six million, six hundred sixty-four thousand, four hundred twenty".