55609865 has 8 divisors (see below), whose sum is σ = 70244160. Its totient is φ = 42146352.

The previous prime is 55609859. The next prime is 55609889. The reversal of 55609865 is 56890655.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55609865 - 2¹⁴ = 55593481 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 292589 + ... + 292778.

It is an arithmetic number, because the mean of its divisors is an integer number (8780520).

Almost surely, 2^55609865 is an apocalyptic number.

It is an amenable number.

55609865 is a deficient number, since it is larger than the sum of its proper divisors (14634295).

55609865 is a wasteful number, since it uses less digits than its factorization.

55609865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 585391.

The product of its (nonzero) digits is 324000, while the sum is 44.

The square root of 55609865 is about 7457.2022233543. The cubic root of 55609865 is about 381.6957112793.

The spelling of 55609865 in words is "fifty-five million, six hundred nine thousand, eight hundred sixty-five".