2218422720 has 56 divisors (see below), whose sum is σ = 7043495184. Its totient is φ = 591579136.

The previous prime is 2218422697. The next prime is 2218422721. The reversal of 2218422720 is 272248122.

It is a super-2 number, since 2×2218422720² = 9842798729224396800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218422721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154469 + ... + 1156388.

Almost surely, 2^2218422720 is an apocalyptic number.

2218422720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2218422720 is an abundant number, since it is smaller than the sum of its proper divisors (4825072464).

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

2218422720 is a wasteful number, since it uses less digits than its factorization.

2218422720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310877 (or 2310867 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 30.

The square root of 2218422720 is about 47100.1350316536. The cubic root of 2218422720 is about 1304.2117287023.

The spelling of 2218422720 in words is "two billion, two hundred eighteen million, four hundred twenty-two thousand, seven hundred twenty".