642317995 has 16 divisors (see below), whose sum is σ = 849528288. Its totient is φ = 462320640.

The previous prime is 642317989. The next prime is 642318023. The reversal of 642317995 is 599713246.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-642317995 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 54864 + ... + 65533.

It is an arithmetic number, because the mean of its divisors is an integer number (53095518).

Almost surely, 2^642317995 is an apocalyptic number.

642317995 is a deficient number, since it is larger than the sum of its proper divisors (207210293).

642317995 is a wasteful number, since it uses less digits than its factorization.

642317995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120510.

The product of its digits is 408240, while the sum is 46.

The square root of 642317995 is about 25343.9932725686. The cubic root of 642317995 is about 862.8130326331.

The spelling of 642317995 in words is "six hundred forty-two million, three hundred seventeen thousand, nine hundred ninety-five".