861975960 has 64 divisors (see below), whose sum is σ = 2600938080. Its totient is φ = 228526080.

The previous prime is 861975953. The next prime is 861976009. The reversal of 861975960 is 69579168.

861975960 is a nontrivial binomial coefficient, being equal to C(41521, 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1 + ... + 41520.

Almost surely, 2^861975960 is an apocalyptic number.

861975960 is the 41520-th triangular number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861975960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1300469040).

861975960 is an abundant number, since it is smaller than the sum of its proper divisors (1738962120).

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

861975960 is a wasteful number, since it uses less digits than its factorization.

861975960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41708 (or 41704 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 51.

The square root of 861975960 is about 29359.4271061273. The cubic root of 861975960 is about 951.6963081640.

The spelling of 861975960 in words is "eight hundred sixty-one million, nine hundred seventy-five thousand, nine hundred sixty".