861633396 has 48 divisors (see below), whose sum is σ = 2405704000. Its totient is φ = 265117536.

The previous prime is 861633379. The next prime is 861633401. The reversal of 861633396 is 693336168.

861633396 is a `hidden beast` number, since 8 + 6 + 1 + 633 + 3 + 9 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 305446 + ... + 308253.

Almost surely, 2^861633396 is an apocalyptic number.

It is an amenable number.

861633396 is an abundant number, since it is smaller than the sum of its proper divisors (1544070604).

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

861633396 is a wasteful number, since it uses less digits than its factorization.

861633396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613725 (or 613717 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 861633396 is about 29353.5925569597. The cubic root of 861633396 is about 951.5702179917.

The spelling of 861633396 in words is "eight hundred sixty-one million, six hundred thirty-three thousand, three hundred ninety-six".