687073 has 2 divisors, whose sum is σ = 687074. Its totient is φ = 687072.

The previous prime is 687061. The next prime is 687083. The reversal of 687073 is 370786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 613089 + 73984 = 783^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 687073 - 2⁵ = 687041 is a prime.

It is not a weakly prime, because it can be changed into another prime (687013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343536 + 343537.

It is an arithmetic number, because the mean of its divisors is an integer number (343537).

2⁶⁸⁷⁰⁷³ is an apocalyptic number.

It is an amenable number.

687073 is a deficient number, since it is larger than the sum of its proper divisors (1).

687073 is an equidigital number, since it uses as much as digits as its factorization.

687073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 687073 is about 828.8986669069. The cubic root of 687073 is about 88.2404323718.

The spelling of 687073 in words is "six hundred eighty-seven thousand, seventy-three".