55222222 has 48 divisors (see below), whose sum is σ = 99743616. Its totient is φ = 22809600.

The previous prime is 55222207. The next prime is 55222229. The reversal of 55222222 is 22222255.

It is a Harshad number since it is a multiple of its sum of digits (22).

55222222 is a modest number, since divided by 22222 gives 552 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 55222193 and 55222202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55222229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127318 + ... + 127750.

It is an arithmetic number, because the mean of its divisors is an integer number (2077992).

Almost surely, 2^55222222 is an apocalyptic number.

55222222 is a deficient number, since it is larger than the sum of its proper divisors (44521394).

55222222 is a wasteful number, since it uses less digits than its factorization.

55222222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 494 counting only the distinct ones).

The product of its digits is 1600, while the sum is 22.

The square root of 55222222 is about 7431.1655882506. The cubic root of 55222222 is about 380.8067394516.

Adding to 55222222 its reverse (22222255), we get a palindrome (77444477).

It can be divided in two parts, 5522 and 2222, that added together give a square (7744 = 88²).

The spelling of 55222222 in words is "fifty-five million, two hundred twenty-two thousand, two hundred twenty-two".