2218332978 has 24 divisors (see below), whose sum is σ = 4908653568. Its totient is φ = 723711192.

The previous prime is 2218332901. The next prime is 2218333027. The reversal of 2218332978 is 8792338122.

2218332978 is a `hidden beast` number, since 221 + 8 + 332 + 97 + 8 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1310226 + ... + 1311917.

It is an arithmetic number, because the mean of its divisors is an integer number (204527232).

Almost surely, 2^2218332978 is an apocalyptic number.

2218332978 is an abundant number, since it is smaller than the sum of its proper divisors (2690320590).

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

2218332978 is a wasteful number, since it uses less digits than its factorization.

2218332978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2622198 (or 2622195 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 2218332978 is about 47099.1823495907. The cubic root of 2218332978 is about 1304.1941420109.

The spelling of 2218332978 in words is "two billion, two hundred eighteen million, three hundred thirty-two thousand, nine hundred seventy-eight".