55999806 has 16 divisors (see below), whose sum is σ = 113672064. Its totient is φ = 18387864.

The previous prime is 55999799. The next prime is 55999807. The reversal of 55999806 is 60899955.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55999807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69250 + ... + 70053.

It is an arithmetic number, because the mean of its divisors is an integer number (7104504).

Almost surely, 2^55999806 is an apocalyptic number.

55999806 is an abundant number, since it is smaller than the sum of its proper divisors (57672258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55999806 is a wasteful number, since it uses less digits than its factorization.

55999806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139375.

The product of its (nonzero) digits is 874800, while the sum is 51.

The square root of 55999806 is about 7483.3018113664. The cubic root of 55999806 is about 382.5857947580.

The spelling of 55999806 in words is "fifty-five million, nine hundred ninety-nine thousand, eight hundred six".