55609815 has 16 divisors (see below), whose sum is σ = 91846656. Its totient is φ = 28701600.

The previous prime is 55609811. The next prime is 55609823. The reversal of 55609815 is 51890655.

55609815 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 55609815 - 2² = 55609811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55609811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59331 + ... + 60260.

It is an arithmetic number, because the mean of its divisors is an integer number (5740416).

Almost surely, 2^55609815 is an apocalyptic number.

55609815 is a deficient number, since it is larger than the sum of its proper divisors (36236841).

55609815 is a wasteful number, since it uses less digits than its factorization.

55609815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119630.

The product of its (nonzero) digits is 54000, while the sum is 39.

The square root of 55609815 is about 7457.1988708898. The cubic root of 55609815 is about 381.6955968824.

The spelling of 55609815 in words is "fifty-five million, six hundred nine thousand, eight hundred fifteen".