642854985 has 16 divisors (see below), whose sum is σ = 1034255040. Its totient is φ = 340960320.

The previous prime is 642854969. The next prime is 642855011. The reversal of 642854985 is 589458246.

It is a happy number.

It is not a de Polignac number, because 642854985 - 2⁴ = 642854969 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 115675 + ... + 121104.

It is an arithmetic number, because the mean of its divisors is an integer number (64640940).

Almost surely, 2^642854985 is an apocalyptic number.

It is an amenable number.

642854985 is a deficient number, since it is larger than the sum of its proper divisors (391400055).

642854985 is a wasteful number, since it uses less digits than its factorization.

642854985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236968.

The product of its digits is 2764800, while the sum is 51.

The square root of 642854985 is about 25354.5850883031. The cubic root of 642854985 is about 863.0534083342.

The spelling of 642854985 in words is "six hundred forty-two million, eight hundred fifty-four thousand, nine hundred eighty-five".