55647729 has 12 divisors (see below), whose sum is σ = 83357456. Its totient is φ = 37098324.

The previous prime is 55647727. The next prime is 55647733. The reversal of 55647729 is 92774655.

55647729 is a `hidden beast` number, since 556 + 4 + 77 + 29 = 666.

It is not a de Polignac number, because 55647729 - 2¹ = 55647727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55647727) 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, 114259 + ... + 114744.

Almost surely, 2^55647729 is an apocalyptic number.

It is an amenable number.

55647729 is a deficient number, since it is larger than the sum of its proper divisors (27709727).

55647729 is an equidigital number, since it uses as much as digits as its factorization.

55647729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229018 (or 229006 counting only the distinct ones).

The product of its digits is 529200, while the sum is 45.

The square root of 55647729 is about 7459.7405450860. The cubic root of 55647729 is about 381.7823220960.

The spelling of 55647729 in words is "fifty-five million, six hundred forty-seven thousand, seven hundred twenty-nine".