55122000 has 80 divisors (see below), whose sum is σ = 177732672. Its totient is φ = 14697600.

The previous prime is 55121993. The next prime is 55122019. The reversal of 55122000 is 22155.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1407 + ... + 10593.

Almost surely, 2^55122000 is an apocalyptic number.

55122000 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 55122000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88866336).

55122000 is an abundant number, since it is smaller than the sum of its proper divisors (122610672).

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

55122000 is a wasteful number, since it uses less digits than its factorization.

55122000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9213 (or 9197 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 55122000 is about 7424.4191692010. The cubic root of 55122000 is about 380.5762264234.

Adding to 55122000 its reverse (22155), we get a palindrome (55144155).

The spelling of 55122000 in words is "fifty-five million, one hundred twenty-two thousand".