861930273604 has 9 divisors (see below), whose sum is σ = 1508381228221. Its totient is φ = 430964208400.

The previous prime is 861930273593. The next prime is 861930273629. The reversal of 861930273604 is 406372039168.

The square root of 861930273604 is 928402.

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., 809103848004 + 52826425600 = 899502^2 + 229840^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1624704 + ... + 2088904.

Almost surely, 2^861930273604 is an apocalyptic number.

861930273604 is the 928402-nd square number.

It is an amenable number.

861930273604 is a deficient number, since it is larger than the sum of its proper divisors (646450954617).

861930273604 is an frugal number, since it uses more digits than its factorization.

861930273604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928406 (or 464203 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 49.

Multiplying 861930273604 by its sum of digits (49), we get a square (42234583406596 = 6498814²).

The spelling of 861930273604 in words is "eight hundred sixty-one billion, nine hundred thirty million, two hundred seventy-three thousand, six hundred four".