726286644 has 18 divisors (see below), whose sum is σ = 1835891330. Its totient is φ = 242095536.

The previous prime is 726286621. The next prime is 726286661. The reversal of 726286644 is 446682627.

It can be written as a sum of positive squares in only one way, i.e., 642014244 + 84272400 = 25338^2 + 9180^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a self number, because there is not a number n which added to its sum of digits gives 726286644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10087279 + ... + 10087350.

Almost surely, 2^726286644 is an apocalyptic number.

It is an amenable number.

726286644 is an abundant number, since it is smaller than the sum of its proper divisors (1109604686).

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

726286644 is a wasteful number, since it uses less digits than its factorization.

726286644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20174639 (or 20174634 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The square root of 726286644 is about 26949.7058239974. The cubic root of 726286644 is about 898.8820043741.

The spelling of 726286644 in words is "seven hundred twenty-six million, two hundred eighty-six thousand, six hundred forty-four".