687893995 has 4 divisors (see below), whose sum is σ = 825472800. Its totient is φ = 550315192.

The previous prime is 687893989. The next prime is 687894013. The reversal of 687893995 is 599398786.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 687893995 - 2⁵ = 687893963 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68789395 + ... + 68789404.

It is an arithmetic number, because the mean of its divisors is an integer number (206368200).

Almost surely, 2^687893995 is an apocalyptic number.

687893995 is a deficient number, since it is larger than the sum of its proper divisors (137578805).

687893995 is a wasteful number, since it uses less digits than its factorization.

687893995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137578804.

The product of its digits is 29393280, while the sum is 64.

The square root of 687893995 is about 26227.7333179976. The cubic root of 687893995 is about 882.7556503732.

The spelling of 687893995 in words is "six hundred eighty-seven million, eight hundred ninety-three thousand, nine hundred ninety-five".