642017323 has 4 divisors (see below), whose sum is σ = 642194680. Its totient is φ = 641839968.

The previous prime is 642017281. The next prime is 642017333. The reversal of 642017323 is 323710246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642017323 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642017291 and 642017300.

It is not an unprimeable number, because it can be changed into a prime (642017333) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83133 + ... + 90526.

It is an arithmetic number, because the mean of its divisors is an integer number (160548670).

Almost surely, 2^642017323 is an apocalyptic number.

642017323 is a deficient number, since it is larger than the sum of its proper divisors (177357).

642017323 is a wasteful number, since it uses less digits than its factorization.

642017323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177356.

The product of its (nonzero) digits is 6048, while the sum is 28.

The square root of 642017323 is about 25338.0607584716. The cubic root of 642017323 is about 862.6783827080.

Adding to 642017323 its reverse (323710246), we get a palindrome (965727569).

The spelling of 642017323 in words is "six hundred forty-two million, seventeen thousand, three hundred twenty-three".