646222442 has 8 divisors (see below), whose sum is σ = 978931332. Its totient is φ = 319912000.

The previous prime is 646222417. The next prime is 646222453. The reversal of 646222442 is 244222646.

It can be written as a sum of positive squares in 2 ways, for example, as 642064921 + 4157521 = 25339^2 + 2039^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 646222399 and 646222408.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1599359 + ... + 1599762.

Almost surely, 2^646222442 is an apocalyptic number.

646222442 is a deficient number, since it is larger than the sum of its proper divisors (332708890).

646222442 is a wasteful number, since it uses less digits than its factorization.

646222442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3199224.

The product of its digits is 36864, while the sum is 32.

The square root of 646222442 is about 25420.9056093602. The cubic root of 646222442 is about 864.5577576089.

The spelling of 646222442 in words is "six hundred forty-six million, two hundred twenty-two thousand, four hundred forty-two".