861330872 has 8 divisors (see below), whose sum is σ = 1614995400. Its totient is φ = 430665432.

The previous prime is 861330871. The next prime is 861330901. The reversal of 861330872 is 278033168.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861330871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53833172 + ... + 53833187.

It is an arithmetic number, because the mean of its divisors is an integer number (201874425).

Almost surely, 2^861330872 is an apocalyptic number.

It is an amenable number.

861330872 is a deficient number, since it is larger than the sum of its proper divisors (753664528).

861330872 is a wasteful number, since it uses less digits than its factorization.

861330872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107666365 (or 107666361 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 861330872 is about 29348.4390044854. The cubic root of 861330872 is about 951.4588378588.

The spelling of 861330872 in words is "eight hundred sixty-one million, three hundred thirty thousand, eight hundred seventy-two".