55622556 has 144 divisors (see below), whose sum is σ = 166053888. Its totient is φ = 15523200.

The previous prime is 55622549. The next prime is 55622561. The reversal of 55622556 is 65522655.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 55622556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 282250 + ... + 282446.

It is an arithmetic number, because the mean of its divisors is an integer number (1153152).

Almost surely, 2^55622556 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 55622556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83026944).

55622556 is an abundant number, since it is smaller than the sum of its proper divisors (110431332).

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

55622556 is a wasteful number, since it uses less digits than its factorization.

55622556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272 (or 267 counting only the distinct ones).

The product of its digits is 90000, while the sum is 36.

The square root of 55622556 is about 7458.0530971561. The cubic root of 55622556 is about 381.7247452875.

Subtracting 55622556 from its reverse (65522655), we obtain a palindrome (9900099).

It can be divided in two parts, 5562 and 2556, that added together give a palindrome (8118).

The spelling of 55622556 in words is "fifty-five million, six hundred twenty-two thousand, five hundred fifty-six".