55722240 has 216 divisors, whose sum is σ = 220653888. Its totient is φ = 12718080.

The previous prime is 55722229. The next prime is 55722241. The reversal of 55722240 is 4222755.

It is not an unprimeable number, because it can be changed into a prime (55722241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80295 + ... + 80985.

Almost surely, 2^55722240 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 55722240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110326944).

55722240 is an abundant number, since it is smaller than the sum of its proper divisors (164931648).

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

55722240 is a wasteful number, since it uses less digits than its factorization.

55722240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 725 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 27.

The square root of 55722240 is about 7464.7330829709. The cubic root of 55722240 is about 381.9526452816.

Adding to 55722240 its reverse (4222755), we get a palindrome (59944995).

The spelling of 55722240 in words is "fifty-five million, seven hundred twenty-two thousand, two hundred forty".