55681344 has 140 divisors (see below), whose sum is σ = 172602144. Its totient is φ = 17715456.

The previous prime is 55681331. The next prime is 55681357. The reversal of 55681344 is 44318655.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55681331) and next prime (55681357).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 55681299 and 55681308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 118999 + ... + 119465.

Almost surely, 2^55681344 is an apocalyptic number.

55681344 is a gapful number since it is divisible by the number (54) 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 55681344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86301072).

55681344 is an abundant number, since it is smaller than the sum of its proper divisors (116920800).

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

55681344 is a wasteful number, since it uses less digits than its factorization.

55681344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 495 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 55681344 is about 7461.9932993805. The cubic root of 55681344 is about 381.8591807552.

Adding to 55681344 its reverse (44318655), we get a palindrome (99999999).

The spelling of 55681344 in words is "fifty-five million, six hundred eighty-one thousand, three hundred forty-four".