861812672 has 28 divisors (see below), whose sum is σ = 1954469040. Its totient is φ = 369348096.

The previous prime is 861812663. The next prime is 861812687. The reversal of 861812672 is 276218168.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961397 + ... + 962292.

Almost surely, 2^861812672 is an apocalyptic number.

It is an amenable number.

861812672 is an abundant number, since it is smaller than the sum of its proper divisors (1092656368).

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

861812672 is a wasteful number, since it uses less digits than its factorization.

861812672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923708 (or 1923698 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 861812672 is about 29356.6461299652. The cubic root of 861812672 is about 951.6362096586.

The spelling of 861812672 in words is "eight hundred sixty-one million, eight hundred twelve thousand, six hundred seventy-two".