2216778 has 16 divisors (see below), whose sum is σ = 4517856. Its totient is φ = 724880.

The previous prime is 2216777. The next prime is 2216803. The reversal of 2216778 is 8776122.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2216777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3168 + ... + 3803.

It is an arithmetic number, because the mean of its divisors is an integer number (282366).

2^2216778 is an apocalyptic number.

2216778 is an abundant number, since it is smaller than the sum of its proper divisors (2301078).

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

2216778 is a wasteful number, since it uses less digits than its factorization.

2216778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7029.

The product of its digits is 9408, while the sum is 33.

The square root of 2216778 is about 1488.8848175732. The cubic root of 2216778 is about 130.3889338471.

The spelling of 2216778 in words is "two million, two hundred sixteen thousand, seven hundred seventy-eight".