642289789 has 4 divisors (see below), whose sum is σ = 670215456. Its totient is φ = 614364124.

The previous prime is 642289787. The next prime is 642289799. The reversal of 642289789 is 987982246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 642289789 - 2¹ = 642289787 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 (642289787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13962799 + ... + 13962844.

It is an arithmetic number, because the mean of its divisors is an integer number (167553864).

Almost surely, 2^642289789 is an apocalyptic number.

It is an amenable number.

642289789 is a deficient number, since it is larger than the sum of its proper divisors (27925667).

642289789 is a wasteful number, since it uses less digits than its factorization.

642289789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27925666.

The product of its digits is 3483648, while the sum is 55.

The square root of 642289789 is about 25343.4368032436. The cubic root of 642289789 is about 862.8004029280.

The spelling of 642289789 in words is "six hundred forty-two million, two hundred eighty-nine thousand, seven hundred eighty-nine".