55999998 has 20 divisors (see below), whose sum is σ = 125481840. Its totient is φ = 18666612.

The previous prime is 55999997. The next prime is 56000003. The reversal of 55999998 is 89999955.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55999991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 172678 + ... + 173001.

It is an arithmetic number, because the mean of its divisors is an integer number (6274092).

Almost surely, 2^55999998 is an apocalyptic number.

55999998 is an abundant number, since it is smaller than the sum of its proper divisors (69481842).

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

55999998 is a wasteful number, since it uses less digits than its factorization.

55999998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345693 (or 345684 counting only the distinct ones).

The product of its digits is 11809800, while the sum is 63.

The square root of 55999998 is about 7483.3146399173. The cubic root of 55999998 is about 382.5862319999.

The spelling of 55999998 in words is "fifty-five million, nine hundred ninety-nine thousand, nine hundred ninety-eight".