2198446778 has 16 divisors (see below), whose sum is σ = 3713506560. Its totient is φ = 967058400.

The previous prime is 2198446763. The next prime is 2198446781. The reversal of 2198446778 is 8776448912.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1611083 + ... + 1612446.

It is an arithmetic number, because the mean of its divisors is an integer number (232094160).

Almost surely, 2^2198446778 is an apocalyptic number.

2198446778 is a deficient number, since it is larger than the sum of its proper divisors (1515059782).

2198446778 is a wasteful number, since it uses less digits than its factorization.

2198446778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223573.

The product of its digits is 5419008, while the sum is 56.

The square root of 2198446778 is about 46887.5972726264. The cubic root of 2198446778 is about 1300.2852979362.

It can be divided in two parts, 219844 and 6778, that added together give a palindrome (226622).

The spelling of 2198446778 in words is "two billion, one hundred ninety-eight million, four hundred forty-six thousand, seven hundred seventy-eight".