55216644 has 48 divisors (see below), whose sum is σ = 150678528. Its totient is φ = 15408288.

The previous prime is 55216633. The next prime is 55216649. The reversal of 55216644 is 44661255.

It is not an unprimeable number, because it can be changed into a prime (55216649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4032 + ... + 11255.

It is an arithmetic number, because the mean of its divisors is an integer number (3139136).

Almost surely, 2^55216644 is an apocalyptic number.

It is an amenable number.

55216644 is an abundant number, since it is smaller than the sum of its proper divisors (95461884).

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

55216644 is a wasteful number, since it uses less digits than its factorization.

55216644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15344 (or 15342 counting only the distinct ones).

The product of its digits is 28800, while the sum is 33.

The square root of 55216644 is about 7430.7902675288. The cubic root of 55216644 is about 380.7939172492.

Adding to 55216644 its reverse (44661255), we get a palindrome (99877899).

The spelling of 55216644 in words is "fifty-five million, two hundred sixteen thousand, six hundred forty-four".