55999986 has 64 divisors (see below), whose sum is σ = 138240000. Its totient is φ = 14769216.

The previous prime is 55999969. The next prime is 55999987. The reversal of 55999986 is 68999955.

It is not an unprimeable number, because it can be changed into a prime (55999987) 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 31 ways as a sum of consecutive naturals, for example, 27015 + ... + 29013.

It is an arithmetic number, because the mean of its divisors is an integer number (2160000).

Almost surely, 2^55999986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55999986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69120000).

55999986 is an abundant number, since it is smaller than the sum of its proper divisors (82240014).

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

55999986 is a wasteful number, since it uses less digits than its factorization.

55999986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2063.

The product of its digits is 7873200, while the sum is 60.

The square root of 55999986 is about 7483.3138381335. The cubic root of 55999986 is about 382.5862046723.

The spelling of 55999986 in words is "fifty-five million, nine hundred ninety-nine thousand, nine hundred eighty-six".