642819224 has 32 divisors (see below), whose sum is σ = 1247491200. Its totient is φ = 310210560.

The previous prime is 642819223. The next prime is 642819269. The reversal of 642819224 is 422918246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642819223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95192 + ... + 101720.

It is an arithmetic number, because the mean of its divisors is an integer number (38984100).

Almost surely, 2^642819224 is an apocalyptic number.

It is an amenable number.

642819224 is a deficient number, since it is larger than the sum of its proper divisors (604671976).

642819224 is a wasteful number, since it uses less digits than its factorization.

642819224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963 (or 6959 counting only the distinct ones).

The product of its digits is 55296, while the sum is 38.

The square root of 642819224 is about 25353.8798608813. The cubic root of 642819224 is about 863.0374046081.

It can be divided in two parts, 6428 and 19224, that added together give a palindrome (25652).

The spelling of 642819224 in words is "six hundred forty-two million, eight hundred nineteen thousand, two hundred twenty-four".