2208640988 has 12 divisors (see below), whose sum is σ = 3918069120. Its totient is φ = 1089192672.

The previous prime is 2208640961. The next prime is 2208641021. The reversal of 2208640988 is 8890468022.

It is a super-2 number, since 2×2208640988² = 9756190027747232288, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3781628 + ... + 3782211.

It is an arithmetic number, because the mean of its divisors is an integer number (326505760).

Almost surely, 2^2208640988 is an apocalyptic number.

It is an amenable number.

2208640988 is a deficient number, since it is larger than the sum of its proper divisors (1709428132).

2208640988 is a wasteful number, since it uses less digits than its factorization.

2208640988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7563916 (or 7563914 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 47.

The square root of 2208640988 is about 46996.1805682121. The cubic root of 2208640988 is about 1302.2920094793.

The spelling of 2208640988 in words is "two billion, two hundred eight million, six hundred forty thousand, nine hundred eighty-eight".