635649985 has 16 divisors (see below), whose sum is σ = 791629200. Its totient is φ = 489400576.

The previous prime is 635649967. The next prime is 635650013. The reversal of 635649985 is 589946536.

It can be written as a sum of positive squares in 8 ways, for example, as 159668496 + 475981489 = 12636^2 + 21817^2 .

It is a cyclic number.

It is not a de Polignac number, because 635649985 - 2⁵ = 635649953 is a prime.

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, 39051 + ... + 52879.

It is an arithmetic number, because the mean of its divisors is an integer number (49476825).

Almost surely, 2^635649985 is an apocalyptic number.

It is an amenable number.

635649985 is a deficient number, since it is larger than the sum of its proper divisors (155979215).

635649985 is a wasteful number, since it uses less digits than its factorization.

635649985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14180.

The product of its digits is 6998400, while the sum is 55.

The square root of 635649985 is about 25212.0999720372. The cubic root of 635649985 is about 859.8169724980.

The spelling of 635649985 in words is "six hundred thirty-five million, six hundred forty-nine thousand, nine hundred eighty-five".