55090800 has 120 divisors (see below), whose sum is σ = 196120880. Its totient is φ = 14688000.

The previous prime is 55090793. The next prime is 55090801. The reversal of 55090800 is 809055.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55090801) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8250 + ... + 13350.

Almost surely, 2^55090800 is an apocalyptic number.

55090800 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 55090800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98060440).

55090800 is an abundant number, since it is smaller than the sum of its proper divisors (141030080).

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

55090800 is a wasteful number, since it uses less digits than its factorization.

55090800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128 (or 5111 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 27.

The square root of 55090800 is about 7422.3176973234. The cubic root of 55090800 is about 380.5044086419.

Adding to 55090800 its reverse (809055), we get a palindrome (55899855).

The spelling of 55090800 in words is "fifty-five million, ninety thousand, eight hundred".