727656661 has 32 divisors (see below), whose sum is σ = 846806400. Its totient is φ = 620605440.

The previous prime is 727656653. The next prime is 727656701. The reversal of 727656661 is 166656727.

It is a cyclic number.

It is not a de Polignac number, because 727656661 - 2³ = 727656653 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 (727657661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1226781 + ... + 1227373.

It is an arithmetic number, because the mean of its divisors is an integer number (26462700).

Almost surely, 2^727656661 is an apocalyptic number.

It is an amenable number.

727656661 is a deficient number, since it is larger than the sum of its proper divisors (119149739).

727656661 is a wasteful number, since it uses less digits than its factorization.

727656661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 789.

The product of its digits is 635040, while the sum is 46.

The square root of 727656661 is about 26975.1118811396. Note that the first 3 decimals coincide. The cubic root of 727656661 is about 899.4468456889.

The spelling of 727656661 in words is "seven hundred twenty-seven million, six hundred fifty-six thousand, six hundred sixty-one".