861942080790 has 192 divisors, whose sum is σ = 2719100275200. Its totient is φ = 193675914432.

The previous prime is 861942080777. The next prime is 861942080807. The reversal of 861942080790 is 97080249168.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 228447 + ... + 1332693.

It is an arithmetic number, because the mean of its divisors is an integer number (14161980600).

Almost surely, 2^861942080790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 861942080790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1359550137600).

861942080790 is an abundant number, since it is smaller than the sum of its proper divisors (1857158194410).

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

861942080790 is a wasteful number, since it uses less digits than its factorization.

861942080790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104336 (or 1104323 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 861942080790 in words is "eight hundred sixty-one billion, nine hundred forty-two million, eighty thousand, seven hundred ninety".