56666729 has 16 divisors (see below), whose sum is σ = 70788096. Its totient is φ = 44236800.

The previous prime is 56666723. The next prime is 56666773. The reversal of 56666729 is 92766665.

It is a cyclic number.

It is not a de Polignac number, because 56666729 - 2⁸ = 56666473 is a prime.

It is a super-2 number, since 2×56666729² = 6422236351118882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56666723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3992 + ... + 11369.

It is an arithmetic number, because the mean of its divisors is an integer number (4424256).

Almost surely, 2^56666729 is an apocalyptic number.

It is an amenable number.

56666729 is a deficient number, since it is larger than the sum of its proper divisors (14121367).

56666729 is a wasteful number, since it uses less digits than its factorization.

56666729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15416.

The product of its digits is 816480, while the sum is 47.

The square root of 56666729 is about 7527.7306673393. The cubic root of 56666729 is about 384.0985916731.

The spelling of 56666729 in words is "fifty-six million, six hundred sixty-six thousand, seven hundred twenty-nine".