642368085 has 16 divisors (see below), whose sum is σ = 1028760576. Its totient is φ = 342272448.

The previous prime is 642368071. The next prime is 642368087. The reversal of 642368085 is 580863246.

It is not a de Polignac number, because 642368085 - 2⁵ = 642368053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642368087) 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 15 ways as a sum of consecutive naturals, for example, 3394 + ... + 36003.

It is an arithmetic number, because the mean of its divisors is an integer number (64297536).

Almost surely, 2^642368085 is an apocalyptic number.

It is an amenable number.

642368085 is a deficient number, since it is larger than the sum of its proper divisors (386392491).

642368085 is a wasteful number, since it uses less digits than its factorization.

642368085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40492.

The product of its (nonzero) digits is 276480, while the sum is 42.

The square root of 642368085 is about 25344.9814559017. The cubic root of 642368085 is about 862.8354603516.

The spelling of 642368085 in words is "six hundred forty-two million, three hundred sixty-eight thousand, eighty-five".