2218625988 has 12 divisors (see below), whose sum is σ = 5176794000. Its totient is φ = 739541992.

The previous prime is 2218625957. The next prime is 2218625993. The reversal of 2218625988 is 8895268122.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×2218625988² = 9844602549257952288, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2218625988.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 92442738 + ... + 92442761.

It is an arithmetic number, because the mean of its divisors is an integer number (431399500).

Almost surely, 2^2218625988 is an apocalyptic number.

It is an amenable number.

2218625988 is an abundant number, since it is smaller than the sum of its proper divisors (2958168012).

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

2218625988 is a wasteful number, since it uses less digits than its factorization.

2218625988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184885506 (or 184885504 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 51.

The square root of 2218625988 is about 47102.2928104355. The cubic root of 2218625988 is about 1304.2515612691.

The spelling of 2218625988 in words is "two billion, two hundred eighteen million, six hundred twenty-five thousand, nine hundred eighty-eight".