55398330 has 80 divisors (see below), whose sum is σ = 160448904. Its totient is φ = 13633920.

The previous prime is 55398293. The next prime is 55398337. The reversal of 55398330 is 3389355.

It can be written as a sum of positive squares in 4 ways, for example, as 41177889 + 14220441 = 6417^2 + 3771^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55398337) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7900 + ... + 13160.

Almost surely, 2^55398330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55398330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80224452).

55398330 is an abundant number, since it is smaller than the sum of its proper divisors (105050574).

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

55398330 is a wasteful number, since it uses less digits than its factorization.

55398330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5293 (or 5284 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 55398330 is about 7443.0054413523. The cubic root of 55398330 is about 381.2111174178.

The spelling of 55398330 in words is "fifty-five million, three hundred ninety-eight thousand, three hundred thirty".