687245 has 16 divisors (see below), whose sum is σ = 905520. Its totient is φ = 497664.

The previous prime is 687233. The next prime is 687277. The reversal of 687245 is 542786.

It can be written as a sum of positive squares in 8 ways, for example, as 24649 + 662596 = 157^2 + 814^2 .

It is a cyclic number.

It is not a de Polignac number, because 687245 - 2⁸ = 686989 is a prime.

Its product of digits (13440) is a multiple of the sum of its prime divisors (224).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6251 + ... + 6359.

It is an arithmetic number, because the mean of its divisors is an integer number (56595).

2⁶⁸⁷²⁴⁵ is an apocalyptic number.

687245 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

687245 is a deficient number, since it is larger than the sum of its proper divisors (218275).

687245 is a wasteful number, since it uses less digits than its factorization.

687245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224.

The product of its digits is 13440, while the sum is 32.

The square root of 687245 is about 829.0024125417. The cubic root of 687245 is about 88.2477950480.

The spelling of 687245 in words is "six hundred eighty-seven thousand, two hundred forty-five".