55747209 has 16 divisors (see below), whose sum is σ = 85234688. Its totient is φ = 31748112.

The previous prime is 55747187. The next prime is 55747213. The reversal of 55747209 is 90274755.

It is not a de Polignac number, because 55747209 - 2⁵ = 55747177 is a prime.

It is a super-2 number, since 2×55747209² = 6215502622579362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55747259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2124 + ... + 10770.

It is an arithmetic number, because the mean of its divisors is an integer number (5327168).

Almost surely, 2^55747209 is an apocalyptic number.

It is an amenable number.

55747209 is a deficient number, since it is larger than the sum of its proper divisors (29487479).

55747209 is a wasteful number, since it uses less digits than its factorization.

55747209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8964.

The product of its (nonzero) digits is 88200, while the sum is 39.

The square root of 55747209 is about 7466.4053600109. The cubic root of 55747209 is about 382.0096874456.

The spelling of 55747209 in words is "fifty-five million, seven hundred forty-seven thousand, two hundred nine".