216672444 has 72 divisors (see below), whose sum is σ = 574636608. Its totient is φ = 68757120.

The previous prime is 216672433. The next prime is 216672451. The reversal of 216672444 is 444276612.

216672444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a junction number, because it is equal to n+sod(n) for n = 216672399 and 216672408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 60874 + ... + 64334.

It is an arithmetic number, because the mean of its divisors is an integer number (7981064).

Almost surely, 2^216672444 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 216672444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (287318304).

216672444 is an abundant number, since it is smaller than the sum of its proper divisors (357964164).

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

216672444 is a wasteful number, since it uses less digits than its factorization.

216672444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3555 (or 3550 counting only the distinct ones).

The product of its digits is 64512, while the sum is 36.

The square root of 216672444 is about 14719.7976888271. The cubic root of 216672444 is about 600.6219883281.

The spelling of 216672444 in words is "two hundred sixteen million, six hundred seventy-two thousand, four hundred forty-four".