55489644 has 96 divisors (see below), whose sum is σ = 170150400. Its totient is φ = 15301440.

The previous prime is 55489627. The next prime is 55489669. The reversal of 55489644 is 44698455.

55489644 is a `hidden beast` number, since 554 + 8 + 96 + 4 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 55489644.

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, 20659 + ... + 23189.

It is an arithmetic number, because the mean of its divisors is an integer number (1772400).

Almost surely, 2^55489644 is an apocalyptic number.

55489644 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 55489644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85075200).

55489644 is an abundant number, since it is smaller than the sum of its proper divisors (114660756).

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

55489644 is a wasteful number, since it uses less digits than its factorization.

55489644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2580 (or 2572 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 55489644 is about 7449.1371312388. The cubic root of 55489644 is about 381.4204546761.

It can be divided in two parts, 5 and 5489644, that added together give a square (5489649 = 2343²).

The spelling of 55489644 in words is "fifty-five million, four hundred eighty-nine thousand, six hundred forty-four".