55999000 has 64 divisors (see below), whose sum is σ = 135626400. Its totient is φ = 21616000.

The previous prime is 55998991. The next prime is 55999007. The reversal of 55999000 is 99955.

It is a happy number.

55999000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55999007) 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, 28035 + ... + 29965.

Almost surely, 2^55999000 is an apocalyptic number.

55999000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55999000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67813200).

55999000 is an abundant number, since it is smaller than the sum of its proper divisors (79627400).

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

55999000 is a wasteful number, since it uses less digits than its factorization.

55999000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1981 (or 1967 counting only the distinct ones).

The product of its (nonzero) digits is 18225, while the sum is 37.

The square root of 55999000 is about 7483.2479579391. The cubic root of 55999000 is about 382.5839592419.

The spelling of 55999000 in words is "fifty-five million, nine hundred ninety-nine thousand".