642216322 has 8 divisors (see below), whose sum is σ = 1050899472. Its totient is φ = 291916500.

The previous prime is 642216313. The next prime is 642216331. The reversal of 642216322 is 223612246.

It is an interprime number because it is at equal distance from previous prime (642216313) and next prime (642216331).

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

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, 14595804 + ... + 14595847.

It is an arithmetic number, because the mean of its divisors is an integer number (131362434).

Almost surely, 2^642216322 is an apocalyptic number.

642216322 is a deficient number, since it is larger than the sum of its proper divisors (408683150).

642216322 is a wasteful number, since it uses less digits than its factorization.

642216322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29191664.

The product of its digits is 6912, while the sum is 28.

The square root of 642216322 is about 25341.9873332776. The cubic root of 642216322 is about 862.7675051222.

Adding to 642216322 its reverse (223612246), we get a palindrome (865828568).

The spelling of 642216322 in words is "six hundred forty-two million, two hundred sixteen thousand, three hundred twenty-two".