55272618 has 40 divisors (see below), whose sum is σ = 124407360. Its totient is φ = 18341640.

The previous prime is 55272617. The next prime is 55272619. The reversal of 55272618 is 81627255.

It is a happy number.

55272618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55272617) and next prime (55272619).

It is not an unprimeable number, because it can be changed into a prime (55272617) 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 19 ways as a sum of consecutive naturals, for example, 43273 + ... + 44531.

It is an arithmetic number, because the mean of its divisors is an integer number (3110184).

Almost surely, 2^55272618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55272618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62203680).

55272618 is an abundant number, since it is smaller than the sum of its proper divisors (69134742).

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

55272618 is a wasteful number, since it uses less digits than its factorization.

55272618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544 (or 1535 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The square root of 55272618 is about 7434.5556693053. Note that the first 3 decimals coincide. The cubic root of 55272618 is about 380.9225461005.

The spelling of 55272618 in words is "fifty-five million, two hundred seventy-two thousand, six hundred eighteen".