873721642 has 16 divisors (see below), whose sum is σ = 1343841192. Its totient is φ = 425880000.

The previous prime is 873721637. The next prime is 873721643. The reversal of 873721642 is 246127378.

It can be written as a sum of positive squares in 4 ways, for example, as 678029521 + 195692121 = 26039^2 + 13989^2 .

It is a junction number, because it is equal to n+sod(n) for n = 873721595 and 873721604.

It is not an unprimeable number, because it can be changed into a prime (873721643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9609 + ... + 42892.

Almost surely, 2^873721642 is an apocalyptic number.

873721642 is a deficient number, since it is larger than the sum of its proper divisors (470119550).

873721642 is a wasteful number, since it uses less digits than its factorization.

873721642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52713.

The product of its digits is 112896, while the sum is 40.

The square root of 873721642 is about 29558.7828233843. The cubic root of 873721642 is about 955.9995718152. Note that the first 3 decimals are identical.

The spelling of 873721642 in words is "eight hundred seventy-three million, seven hundred twenty-one thousand, six hundred forty-two".