642445233 has 16 divisors (see below), whose sum is σ = 903302400. Its totient is φ = 405023760.

The previous prime is 642445231. The next prime is 642445247. The reversal of 642445233 is 332544246.

It is not a de Polignac number, because 642445233 - 2¹ = 642445231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642445194 and 642445203.

It is not an unprimeable number, because it can be changed into a prime (642445231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22678 + ... + 42416.

It is an arithmetic number, because the mean of its divisors is an integer number (56456400).

Almost surely, 2^642445233 is an apocalyptic number.

It is an amenable number.

642445233 is a deficient number, since it is larger than the sum of its proper divisors (260857167).

642445233 is a wasteful number, since it uses less digits than its factorization.

642445233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20332.

The product of its digits is 69120, while the sum is 33.

The square root of 642445233 is about 25346.5033683149. The cubic root of 642445233 is about 862.8700009662.

Adding to 642445233 its reverse (332544246), we get a palindrome (974989479).

The spelling of 642445233 in words is "six hundred forty-two million, four hundred forty-five thousand, two hundred thirty-three".