55218570 has 32 divisors (see below), whose sum is σ = 144573120. Its totient is φ = 13386240.

The previous prime is 55218563. The next prime is 55218571. The reversal of 55218570 is 7581255.

It is a happy number.

It is a super-3 number, since 3×55218570³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (55218571) 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 15 ways as a sum of consecutive naturals, for example, 83335 + ... + 83994.

It is an arithmetic number, because the mean of its divisors is an integer number (4517910).

Almost surely, 2^55218570 is an apocalyptic number.

55218570 is an abundant number, since it is smaller than the sum of its proper divisors (89354550).

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

55218570 is a wasteful number, since it uses less digits than its factorization.

55218570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167350.

The product of its (nonzero) digits is 14000, while the sum is 33.

The square root of 55218570 is about 7430.9198623051. The cubic root of 55218570 is about 380.7983446616.

It can be divided in two parts, 552185 and 70, that added together give a palindrome (552255).

The spelling of 55218570 in words is "fifty-five million, two hundred eighteen thousand, five hundred seventy".