642722303 has 4 divisors (see below), whose sum is σ = 642821328. Its totient is φ = 642623280.

The previous prime is 642722263. The next prime is 642722309. The reversal of 642722303 is 303227246.

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

It is a cyclic number.

It is not a de Polignac number, because 642722303 - 2²⁶ = 575613439 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 (642722309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39038 + ... + 53003.

It is an arithmetic number, because the mean of its divisors is an integer number (160705332).

Almost surely, 2^642722303 is an apocalyptic number.

642722303 is a deficient number, since it is larger than the sum of its proper divisors (99025).

642722303 is an equidigital number, since it uses as much as digits as its factorization.

642722303 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99024.

The product of its (nonzero) digits is 12096, while the sum is 29.

The square root of 642722303 is about 25351.9684245622. The cubic root of 642722303 is about 862.9940276370.

Adding to 642722303 its reverse (303227246), we get a palindrome (945949549).

The spelling of 642722303 in words is "six hundred forty-two million, seven hundred twenty-two thousand, three hundred three".