55805000 has 40 divisors (see below), whose sum is σ = 130762830. Its totient is φ = 22320000.

The previous prime is 55804993. The next prime is 55805003. The reversal of 55805000 is 50855.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 2427364 + 53377636 = 1558^2 + 7306^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×55805000² = 6228396050000000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55805003) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 581 + ... + 10580.

Almost surely, 2^55805000 is an apocalyptic number.

55805000 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 55805000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65381415).

55805000 is an abundant number, since it is smaller than the sum of its proper divisors (74957830).

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

55805000 is a wasteful number, since it uses less digits than its factorization.

55805000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11187 (or 11168 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 55805000 is about 7470.2744260168. The cubic root of 55805000 is about 382.1416468025.

Adding to 55805000 its reverse (50855), we get a palindrome (55855855).

The spelling of 55805000 in words is "fifty-five million, eight hundred five thousand".