642585085 has 8 divisors (see below), whose sum is σ = 772222176. Its totient is φ = 513321360.

The previous prime is 642585049. The next prime is 642585089. The reversal of 642585085 is 580585246.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642585085 - 2²¹ = 640487933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642585089) 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, 89539 + ... + 96448.

It is an arithmetic number, because the mean of its divisors is an integer number (96527772).

Almost surely, 2^642585085 is an apocalyptic number.

It is an amenable number.

642585085 is a deficient number, since it is larger than the sum of its proper divisors (129637091).

642585085 is a wasteful number, since it uses less digits than its factorization.

642585085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186683.

The product of its (nonzero) digits is 384000, while the sum is 43.

The square root of 642585085 is about 25349.2620208163. The cubic root of 642585085 is about 862.9326082951.

The spelling of 642585085 in words is "six hundred forty-two million, five hundred eighty-five thousand, eighty-five".