55422240 has 192 divisors, whose sum is σ = 188697600. Its totient is φ = 13630464.

The previous prime is 55422239. The next prime is 55422251. The reversal of 55422240 is 4222455.

It is a happy number.

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 55422240.

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, 538029 + ... + 538131.

It is an arithmetic number, because the mean of its divisors is an integer number (982800).

Almost surely, 2^55422240 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 55422240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94348800).

55422240 is an abundant number, since it is smaller than the sum of its proper divisors (133275360).

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

55422240 is a wasteful number, since it uses less digits than its factorization.

55422240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 24.

The square root of 55422240 is about 7444.6114740798. The cubic root of 55422240 is about 381.2659532875.

Adding to 55422240 its reverse (4222455), we get a palindrome (59644695).

It can be divided in two parts, 5 and 5422240, that added together give a palindrome (5422245).

The spelling of 55422240 in words is "fifty-five million, four hundred twenty-two thousand, two hundred forty".