55218672 has 100 divisors (see below), whose sum is σ = 161503056. Its totient is φ = 18213120.

The previous prime is 55218671. The next prime is 55218679. The reversal of 55218672 is 27681255.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55218671) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 177397 + ... + 177707.

Almost surely, 2^55218672 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 55218672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80751528).

55218672 is an abundant number, since it is smaller than the sum of its proper divisors (106284384).

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

55218672 is a wasteful number, since it uses less digits than its factorization.

55218672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 453 counting only the distinct ones).

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

The square root of 55218672 is about 7430.9267255168. The cubic root of 55218672 is about 380.7985791322.

The spelling of 55218672 in words is "fifty-five million, two hundred eighteen thousand, six hundred seventy-two".