687960089 has 2 divisors, whose sum is σ = 687960090. Its totient is φ = 687960088.

The previous prime is 687960079. The next prime is 687960101. The reversal of 687960089 is 980069786.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 597558025 + 90402064 = 24445^2 + 9508^2 .

It is a cyclic number.

It is not a de Polignac number, because 687960089 - 2⁴ = 687960073 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687960089.

It is not a weakly prime, because it can be changed into another prime (687960059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343980044 + 343980045.

It is an arithmetic number, because the mean of its divisors is an integer number (343980045).

Almost surely, 2^687960089 is an apocalyptic number.

It is an amenable number.

687960089 is a deficient number, since it is larger than the sum of its proper divisors (1).

687960089 is an equidigital number, since it uses as much as digits as its factorization.

687960089 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 53.

The square root of 687960089 is about 26228.9932898691. The cubic root of 687960089 is about 882.7839216785.

The spelling of 687960089 in words is "six hundred eighty-seven million, nine hundred sixty thousand, eighty-nine".