55453440 has 144 divisors (see below), whose sum is σ = 202503168. Its totient is φ = 12668928.

The previous prime is 55453429. The next prime is 55453459. The reversal of 55453440 is 4435455.

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 = 55453398 and 55453407.

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, 25849 + ... + 27911.

It is an arithmetic number, because the mean of its divisors is an integer number (1406272).

Almost surely, 2^55453440 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 55453440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (101251584).

55453440 is an abundant number, since it is smaller than the sum of its proper divisors (147049728).

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

55453440 is a wasteful number, since it uses less digits than its factorization.

55453440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2094 (or 2080 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

The square root of 55453440 is about 7446.7066546226. The cubic root of 55453440 is about 381.3374845370.

Adding to 55453440 its reverse (4435455), we get a palindrome (59888895).

The spelling of 55453440 in words is "fifty-five million, four hundred fifty-three thousand, four hundred forty".