642040259 has 8 divisors (see below), whose sum is σ = 733972320. Its totient is φ = 550161216.

The previous prime is 642040253. The next prime is 642040327. The reversal of 642040259 is 952040246.

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-642040259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642040253) 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, 17447 + ... + 39855.

It is an arithmetic number, because the mean of its divisors is an integer number (91746540).

Almost surely, 2^642040259 is an apocalyptic number.

642040259 is a deficient number, since it is larger than the sum of its proper divisors (91932061).

642040259 is a wasteful number, since it uses less digits than its factorization.

642040259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26509.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 642040259 is about 25338.5133541808. The cubic root of 642040259 is about 862.6886556165.

The spelling of 642040259 in words is "six hundred forty-two million, forty thousand, two hundred fifty-nine".