55440330 has 64 divisors (see below), whose sum is σ = 148566528. Its totient is φ = 13124160.

The previous prime is 55440317. The next prime is 55440337. The reversal of 55440330 is 3304455.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 55440330.

It is not an unprimeable number, because it can be changed into a prime (55440337) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12237 + ... + 16143.

It is an arithmetic number, because the mean of its divisors is an integer number (2321352).

Almost surely, 2^55440330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55440330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74283264).

55440330 is an abundant number, since it is smaller than the sum of its proper divisors (93126198).

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

55440330 is a wasteful number, since it uses less digits than its factorization.

55440330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3971.

The product of its (nonzero) digits is 3600, while the sum is 24.

The square root of 55440330 is about 7445.8263476930. The cubic root of 55440330 is about 381.3074309254.

Adding to 55440330 its reverse (3304455), we get a palindrome (58744785).

The spelling of 55440330 in words is "fifty-five million, four hundred forty thousand, three hundred thirty".