687870609 has 16 divisors (see below), whose sum is σ = 975405888. Its totient is φ = 429696512.

The previous prime is 687870607. The next prime is 687870611. The reversal of 687870609 is 906078786.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (687870607) and next prime (687870611).

It is a cyclic number.

It is not a de Polignac number, because 687870609 - 2¹ = 687870607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (687870607) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18132 + ... + 41285.

It is an arithmetic number, because the mean of its divisors is an integer number (60962868).

Almost surely, 2^687870609 is an apocalyptic number.

It is an amenable number.

687870609 is a deficient number, since it is larger than the sum of its proper divisors (287535279).

687870609 is a wasteful number, since it uses less digits than its factorization.

687870609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59664.

The product of its (nonzero) digits is 1016064, while the sum is 51.

The square root of 687870609 is about 26227.2874884156. The cubic root of 687870609 is about 882.7456467206.

The spelling of 687870609 in words is "six hundred eighty-seven million, eight hundred seventy thousand, six hundred nine".