55309000 has 128 divisors (see below), whose sum is σ = 141523200. Its totient is φ = 20160000.

The previous prime is 55308971. The next prime is 55309013. The reversal of 55309000 is 90355.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 778965 + ... + 779035.

It is an arithmetic number, because the mean of its divisors is an integer number (1105650).

Almost surely, 2^55309000 is an apocalyptic number.

55309000 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 55309000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70761600).

55309000 is an abundant number, since it is smaller than the sum of its proper divisors (86214200).

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

55309000 is a wasteful number, since it uses less digits than its factorization.

55309000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152 (or 138 counting only the distinct ones).

The product of its (nonzero) digits is 675, while the sum is 22.

The square root of 55309000 is about 7437.0020841734. The cubic root of 55309000 is about 381.0061057662.

Adding to 55309000 its reverse (90355), we get a palindrome (55399355).

The spelling of 55309000 in words is "fifty-five million, three hundred nine thousand".