2178617216 has 32 divisors (see below), whose sum is σ = 4568651400. Its totient is φ = 1031975424.

The previous prime is 2178617153. The next prime is 2178617227. The reversal of 2178617216 is 6127168712.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 445475 + ... + 450338.

Almost surely, 2^2178617216 is an apocalyptic number.

It is an amenable number.

2178617216 is an abundant number, since it is smaller than the sum of its proper divisors (2390034184).

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

2178617216 is an equidigital number, since it uses as much as digits as its factorization.

2178617216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895846 (or 895834 counting only the distinct ones).

The product of its digits is 56448, while the sum is 41.

The square root of 2178617216 is about 46675.6597810893. The cubic root of 2178617216 is about 1296.3640444565.

The spelling of 2178617216 in words is "two billion, one hundred seventy-eight million, six hundred seventeen thousand, two hundred sixteen".