727646661 has 12 divisors (see below), whose sum is σ = 1201194592. Its totient is φ = 415798056.

The previous prime is 727646659. The next prime is 727646677. The reversal of 727646661 is 166646727.

It is a happy number.

727646661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 727646661 - 2¹ = 727646659 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (717646661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5774911 + ... + 5775036.

Almost surely, 2^727646661 is an apocalyptic number.

It is an amenable number.

727646661 is a deficient number, since it is larger than the sum of its proper divisors (473547931).

727646661 is a wasteful number, since it uses less digits than its factorization.

727646661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11549960 (or 11549957 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 727646661 is about 26974.9265244597. The cubic root of 727646661 is about 899.4427253805.

The spelling of 727646661 in words is "seven hundred twenty-seven million, six hundred forty-six thousand, six hundred sixty-one".