687873349 has 2 divisors, whose sum is σ = 687873350. Its totient is φ = 687873348.

The previous prime is 687873323. The next prime is 687873367. The reversal of 687873349 is 943378786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 670292100 + 17581249 = 25890^2 + 4193^2 .

It is a cyclic number.

It is not a de Polignac number, because 687873349 - 2⁵ = 687873317 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687873349.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (687870349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343936674 + 343936675.

It is an arithmetic number, because the mean of its divisors is an integer number (343936675).

Almost surely, 2^687873349 is an apocalyptic number.

It is an amenable number.

687873349 is a deficient number, since it is larger than the sum of its proper divisors (1).

687873349 is an equidigital number, since it uses as much as digits as its factorization.

687873349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6096384, while the sum is 55.

The square root of 687873349 is about 26227.3397240361. The cubic root of 687873349 is about 882.7468188014.

The spelling of 687873349 in words is "six hundred eighty-seven million, eight hundred seventy-three thousand, three hundred forty-nine".