2218946720 has 24 divisors (see below), whose sum is σ = 5242262004. Its totient is φ = 887578624.

The previous prime is 2218946699. The next prime is 2218946729. The reversal of 2218946720 is 276498122.

It can be written as a sum of positive squares in 2 ways, for example, as 2011701904 + 207244816 = 44852^2 + 14396^2 .

It is not an unprimeable number, because it can be changed into a prime (2218946729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6934049 + ... + 6934368.

Almost surely, 2^2218946720 is an apocalyptic number.

2218946720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2218946720 is an abundant number, since it is smaller than the sum of its proper divisors (3023315284).

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

2218946720 is a wasteful number, since it uses less digits than its factorization.

2218946720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13868432 (or 13868424 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 2218946720 is about 47105.6973199633. The cubic root of 2218946720 is about 1304.3144072314.

The spelling of 2218946720 in words is "two billion, two hundred eighteen million, nine hundred forty-six thousand, seven hundred twenty".