54445440 has 128 divisors (see below), whose sum is σ = 198385920. Its totient is φ = 12441600.

The previous prime is 54445399. The next prime is 54445451. The reversal of 54445440 is 4454445.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 54445398 and 54445407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11415 + ... + 15465.

It is an arithmetic number, because the mean of its divisors is an integer number (1549890).

Almost surely, 2^54445440 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 54445440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99192960).

54445440 is an abundant number, since it is smaller than the sum of its proper divisors (143940480).

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

54445440 is a wasteful number, since it uses less digits than its factorization.

54445440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4080 (or 4068 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 30.

The square root of 54445440 is about 7378.7153353412. The cubic root of 54445440 is about 379.0127651917.

Adding to 54445440 its reverse (4454445), we get a palindrome (58899885).

The spelling of 54445440 in words is "fifty-four million, four hundred forty-five thousand, four hundred forty".