55113312 has 48 divisors (see below), whose sum is σ = 145681200. Its totient is φ = 18243072.

The previous prime is 55113299. The next prime is 55113341. The reversal of 55113312 is 21331155.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12378 + ... + 16230.

It is an arithmetic number, because the mean of its divisors is an integer number (3035025).

Almost surely, 2^55113312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55113312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72840600).

55113312 is an abundant number, since it is smaller than the sum of its proper divisors (90567888).

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

55113312 is a wasteful number, since it uses less digits than its factorization.

55113312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015 (or 4007 counting only the distinct ones).

The product of its digits is 450, while the sum is 21.

The square root of 55113312 is about 7423.8340498694. The cubic root of 55113312 is about 380.5562306565.

Adding to 55113312 its reverse (21331155), we get a palindrome (76444467).

The spelling of 55113312 in words is "fifty-five million, one hundred thirteen thousand, three hundred twelve".