642229585 has 8 divisors (see below), whose sum is σ = 771085800. Its totient is φ = 513510144.

The previous prime is 642229579. The next prime is 642229589. The reversal of 642229585 is 585922246.

It can be written as a sum of positive squares in 4 ways, for example, as 285170769 + 357058816 = 16887^2 + 18896^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 642229585 - 2²⁵ = 608675153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642229589) 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, 23560 + ... + 42889.

It is an arithmetic number, because the mean of its divisors is an integer number (96385725).

Almost surely, 2^642229585 is an apocalyptic number.

It is an amenable number.

642229585 is a deficient number, since it is larger than the sum of its proper divisors (128856215).

642229585 is a wasteful number, since it uses less digits than its factorization.

642229585 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68387.

The product of its digits is 345600, while the sum is 43.

The square root of 642229585 is about 25342.2490122720. The cubic root of 642229585 is about 862.7734443498.

The spelling of 642229585 in words is "six hundred forty-two million, two hundred twenty-nine thousand, five hundred eighty-five".