55942218 has 64 divisors (see below), whose sum is σ = 130032000. Its totient is φ = 17805312.

The previous prime is 55942217. The next prime is 55942231. The reversal of 55942218 is 81224955.

55942218 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (55942217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 217546 + ... + 217802.

It is an arithmetic number, because the mean of its divisors is an integer number (2031750).

Almost surely, 2^55942218 is an apocalyptic number.

55942218 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55942218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65016000).

55942218 is an abundant number, since it is smaller than the sum of its proper divisors (74089782).

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

55942218 is a wasteful number, since it uses less digits than its factorization.

55942218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 430 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 55942218 is about 7479.4530548697. The cubic root of 55942218 is about 382.4546043781.

The spelling of 55942218 in words is "fifty-five million, nine hundred forty-two thousand, two hundred eighteen".