861475776 has 112 divisors (see below), whose sum is σ = 2618841600. Its totient is φ = 244823040.

The previous prime is 861475759. The next prime is 861475777. The reversal of 861475776 is 677574168.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (861475777) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 265846 + ... + 269066.

Almost surely, 2^861475776 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861475776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1309420800).

861475776 is an abundant number, since it is smaller than the sum of its proper divisors (1757365824).

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

861475776 is a wasteful number, since it uses less digits than its factorization.

861475776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3442 (or 3432 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 51.

The square root of 861475776 is about 29350.9075839232. The cubic root of 861475776 is about 951.5121903568.

The spelling of 861475776 in words is "eight hundred sixty-one million, four hundred seventy-five thousand, seven hundred seventy-six".