55411440 has 80 divisors (see below), whose sum is σ = 196320768. Its totient is φ = 12665088.

The previous prime is 55411403. The next prime is 55411441. The reversal of 55411440 is 4411455.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 55411440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55411441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14812 + ... + 18171.

Almost surely, 2^55411440 is an apocalyptic number.

It is an amenable number.

55411440 is an abundant number, since it is smaller than the sum of its proper divisors (140909328).

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

55411440 is a wasteful number, since it uses less digits than its factorization.

55411440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33006 (or 33000 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 24.

The square root of 55411440 is about 7443.8860818795. The cubic root of 55411440 is about 381.2411862157.

Adding to 55411440 its reverse (4411455), we get a palindrome (59822895).

The spelling of 55411440 in words is "fifty-five million, four hundred eleven thousand, four hundred forty".