642368459 has 8 divisors (see below), whose sum is σ = 656147520. Its totient is φ = 628685896.

The previous prime is 642368431. The next prime is 642368479. The reversal of 642368459 is 954863246.

642368459 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642368459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642368479) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10589 + ... + 37374.

It is an arithmetic number, because the mean of its divisors is an integer number (82018440).

Almost surely, 2^642368459 is an apocalyptic number.

642368459 is a deficient number, since it is larger than the sum of its proper divisors (13779061).

642368459 is a wasteful number, since it uses less digits than its factorization.

642368459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48249.

The product of its digits is 1244160, while the sum is 47.

The square root of 642368459 is about 25344.9888340871. The cubic root of 642368459 is about 862.8356278051.

The spelling of 642368459 in words is "six hundred forty-two million, three hundred sixty-eight thousand, four hundred fifty-nine".