646822222 has 16 divisors (see below), whose sum is σ = 1027847232. Its totient is φ = 304226560.

The previous prime is 646822219. The next prime is 646822249. The reversal of 646822222 is 222228646.

It is a Harshad number since it is a multiple of its sum of digits (34).

646822222 is a modest number, since divided by 22222 gives 6468 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 82722 + ... + 90202.

It is an arithmetic number, because the mean of its divisors is an integer number (64240452).

Almost surely, 2^646822222 is an apocalyptic number.

646822222 is a deficient number, since it is larger than the sum of its proper divisors (381025010).

646822222 is a wasteful number, since it uses less digits than its factorization.

646822222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10043.

The product of its digits is 36864, while the sum is 34.

The square root of 646822222 is about 25432.6998566806. The cubic root of 646822222 is about 864.8251495959.

It can be divided in two parts, 64 and 6822222, that added together give a palindrome (6822286).

The spelling of 646822222 in words is "six hundred forty-six million, eight hundred twenty-two thousand, two hundred twenty-two".