642642587 has 2 divisors, whose sum is σ = 642642588. Its totient is φ = 642642586.

The previous prime is 642642577. The next prime is 642642629. The reversal of 642642587 is 785246246.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 642642587 - 2⁴ = 642642571 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (642642547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321321293 + 321321294.

It is an arithmetic number, because the mean of its divisors is an integer number (321321294).

Almost surely, 2^642642587 is an apocalyptic number.

642642587 is a deficient number, since it is larger than the sum of its proper divisors (1).

642642587 is an equidigital number, since it uses as much as digits as its factorization.

642642587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 645120, while the sum is 44.

The square root of 642642587 is about 25350.3961901979. The cubic root of 642642587 is about 862.9583474913.

The spelling of 642642587 in words is "six hundred forty-two million, six hundred forty-two thousand, five hundred eighty-seven".