222690816 has 160 divisors (see below), whose sum is σ = 670269600. Its totient is φ = 72990720.

The previous prime is 222690799. The next prime is 222690863. The reversal of 222690816 is 618096222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 15 ways as a sum of consecutive naturals, for example, 1230246 + ... + 1230426.

It is an arithmetic number, because the mean of its divisors is an integer number (4189185).

Almost surely, 2^222690816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 222690816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (335134800).

222690816 is an abundant number, since it is smaller than the sum of its proper divisors (447578784).

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

222690816 is an equidigital number, since it uses as much as digits as its factorization.

222690816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 297 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 222690816 is about 14922.8286862779. The cubic root of 222690816 is about 606.1323110764.

The spelling of 222690816 in words is "two hundred twenty-two million, six hundred ninety thousand, eight hundred sixteen".