861668384 has 12 divisors (see below), whose sum is σ = 1696409694. Its totient is φ = 430834176.

The previous prime is 861668383. The next prime is 861668429. The reversal of 861668384 is 483866168.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 491952400 + 369715984 = 22180^2 + 19228^2 .

It is not an unprimeable number, because it can be changed into a prime (861668383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13463537 + ... + 13463600.

Almost surely, 2^861668384 is an apocalyptic number.

It is an amenable number.

861668384 is a deficient number, since it is larger than the sum of its proper divisors (834741310).

861668384 is a wasteful number, since it uses less digits than its factorization.

861668384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26927147 (or 26927139 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 50.

The square root of 861668384 is about 29354.1885256602. The cubic root of 861668384 is about 951.5830978268.

The spelling of 861668384 in words is "eight hundred sixty-one million, six hundred sixty-eight thousand, three hundred eighty-four".