687173796 has 81 divisors (see below), whose sum is σ = 1852418659. Its totient is φ = 214745088.

The previous prime is 687173791. The next prime is 687173843. The reversal of 687173796 is 697371786.

The square root of 687173796 is 26214.

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

It can be written as a sum of positive squares in 4 ways, for example, as 458559396 + 228614400 = 21414^2 + 15120^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687173791) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2673700 + ... + 2673956.

Almost surely, 2^687173796 is an apocalyptic number.

687173796 is the 26214-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687173796

687173796 is an abundant number, since it is smaller than the sum of its proper divisors (1165244863).

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

687173796 is a wasteful number, since it uses less digits than its factorization.

687173796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 279 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The cubic root of 687173796 is about 882.4474722030.

The spelling of 687173796 in words is "six hundred eighty-seven million, one hundred seventy-three thousand, seven hundred ninety-six".