642730423 has 16 divisors (see below), whose sum is σ = 710784000. Its totient is φ = 578460960.

The previous prime is 642730379. The next prime is 642730453. The reversal of 642730423 is 324037246.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642730423 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642730453) 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, 60178 + ... + 70048.

It is an arithmetic number, because the mean of its divisors is an integer number (44424000).

Almost surely, 2^642730423 is an apocalyptic number.

642730423 is a deficient number, since it is larger than the sum of its proper divisors (68053577).

642730423 is a wasteful number, since it uses less digits than its factorization.

642730423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10062.

The product of its (nonzero) digits is 24192, while the sum is 31.

The square root of 642730423 is about 25352.1285694121. The cubic root of 642730423 is about 862.9976619085.

Adding to 642730423 its reverse (324037246), we get a palindrome (966767669).

The spelling of 642730423 in words is "six hundred forty-two million, seven hundred thirty thousand, four hundred twenty-three".