55722220 has 24 divisors (see below), whose sum is σ = 118667808. Its totient is φ = 21974400.

The previous prime is 55722203. The next prime is 55722223. The reversal of 55722220 is 2222755.

It is not an unprimeable number, because it can be changed into a prime (55722223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18201 + ... + 21040.

It is an arithmetic number, because the mean of its divisors is an integer number (4944492).

Almost surely, 2^55722220 is an apocalyptic number.

It is an amenable number.

55722220 is an abundant number, since it is smaller than the sum of its proper divisors (62945588).

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

55722220 is a wasteful number, since it uses less digits than its factorization.

55722220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39321 (or 39319 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 25.

The square root of 55722220 is about 7464.7317433381. The cubic root of 55722220 is about 381.9525995844.

Adding to 55722220 its reverse (2222755), we get a palindrome (57944975).

The spelling of 55722220 in words is "fifty-five million, seven hundred twenty-two thousand, two hundred twenty".