55451440 has 80 divisors (see below), whose sum is σ = 143089056. Its totient is φ = 19814400.

The previous prime is 55451423. The next prime is 55451441. The reversal of 55451440 is 4415455.

55451440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 55451399 and 55451408.

It is not an unprimeable number, because it can be changed into a prime (55451441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53164 + ... + 54196.

Almost surely, 2^55451440 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 55451440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71544528).

55451440 is an abundant number, since it is smaller than the sum of its proper divisors (87637616).

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

55451440 is a wasteful number, since it uses less digits than its factorization.

55451440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1118 (or 1112 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 28.

The square root of 55451440 is about 7446.5723658607. The cubic root of 55451440 is about 381.3329000055.

Adding to 55451440 its reverse (4415455), we get a palindrome (59866895).

The spelling of 55451440 in words is "fifty-five million, four hundred fifty-one thousand, four hundred forty".