861785448976 has 15 divisors (see below), whose sum is σ = 1669716501933. Its totient is φ = 430890867840.

The previous prime is 861785448973. The next prime is 861785449033. The reversal of 861785448976 is 679844587168.

The square root of 861785448976 is 928324.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 836998095376 + 24787353600 = 914876^2 + 157440^2 .

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 861785448899 and 861785448908.

It is not an unprimeable number, because it can be changed into a prime (861785448973) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 3597256 + ... + 3829336.

Almost surely, 2^861785448976 is an apocalyptic number.

861785448976 is the 928324-th square number.

It is an amenable number.

861785448976 is a deficient number, since it is larger than the sum of its proper divisors (807931052957).

861785448976 is an frugal number, since it uses more digits than its factorization.

861785448976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 464170 (or 232083 counting only the distinct ones).

The product of its digits is 650280960, while the sum is 73.

The spelling of 861785448976 in words is "eight hundred sixty-one billion, seven hundred eighty-five million, four hundred forty-eight thousand, nine hundred seventy-six".