861049944 has 96 divisors (see below), whose sum is σ = 2376410400. Its totient is φ = 281594880.

The previous prime is 861049939. The next prime is 861049951. The reversal of 861049944 is 449940168.

It is a self number, because there is not a number n which added to its sum of digits gives 861049944.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 1988352 + ... + 1988784.

It is an arithmetic number, because the mean of its divisors is an integer number (24754275).

Almost surely, 2^861049944 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 861049944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1188205200).

861049944 is an abundant number, since it is smaller than the sum of its proper divisors (1515360456).

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

861049944 is a wasteful number, since it uses less digits than its factorization.

861049944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 905 (or 898 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 861049944 is about 29343.6525333845. The cubic root of 861049944 is about 951.3553853599.

The spelling of 861049944 in words is "eight hundred sixty-one million, forty-nine thousand, nine hundred forty-four".