861043968 has 54 divisors (see below), whose sum is σ = 2482608674. Its totient is φ = 287013888.

The previous prime is 861043933. The next prime is 861043973. The reversal of 861043968 is 869340168.

It can be written as a sum of positive squares in only one way, i.e., 738100224 + 122943744 = 27168^2 + 11088^2 .

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 5 ways as a sum of consecutive naturals, for example, 184555 + ... + 189162.

Almost surely, 2^861043968 is an apocalyptic number.

It is an amenable number.

861043968 is an abundant number, since it is smaller than the sum of its proper divisors (1621564706).

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

861043968 is a wasteful number, since it uses less digits than its factorization.

861043968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 373739 (or 373722 counting only the distinct ones).

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

The square root of 861043968 is about 29343.5507053935. The cubic root of 861043968 is about 951.3531844373.

The spelling of 861043968 in words is "eight hundred sixty-one million, forty-three thousand, nine hundred sixty-eight".