7218444240 has 480 divisors, whose sum is σ = 29236985856. Its totient is φ = 1561144320.

The previous prime is 7218444229. The next prime is 7218444257. The reversal of 7218444240 is 424448127.

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 = 7218444195 and 7218444204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 7342789 + ... + 7343771.

Almost surely, 2^7218444240 is an apocalyptic number.

7218444240 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7218444240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14618492928).

7218444240 is an abundant number, since it is smaller than the sum of its proper divisors (22018541616).

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

7218444240 is a wasteful number, since it uses less digits than its factorization.

7218444240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1087 (or 1078 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 36.

The square root of 7218444240 is about 84961.4279541016. The cubic root of 7218444240 is about 1932.6262260187.

The spelling of 7218444240 in words is "seven billion, two hundred eighteen million, four hundred forty-four thousand, two hundred forty".