852561636 has 24 divisors (see below), whose sum is σ = 1989956640. Its totient is φ = 284094912.

The previous prime is 852561599. The next prime is 852561707. The reversal of 852561636 is 636165258.

It is a happy number.

It is a super-2 number, since 2×852561636² = 1453722686357992992, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34200 + ... + 53616.

It is an arithmetic number, because the mean of its divisors is an integer number (82914860).

Almost surely, 2^852561636 is an apocalyptic number.

It is an amenable number.

852561636 is an abundant number, since it is smaller than the sum of its proper divisors (1137395004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

852561636 is a wasteful number, since it uses less digits than its factorization.

852561636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23083 (or 23081 counting only the distinct ones).

The product of its digits is 259200, while the sum is 42.

The square root of 852561636 is about 29198.6581198520. The cubic root of 852561636 is about 948.2188736024.

The spelling of 852561636 in words is "eight hundred fifty-two million, five hundred sixty-one thousand, six hundred thirty-six".