687853994 has 8 divisors (see below), whose sum is σ = 1041424128. Its totient is φ = 340712620.

The previous prime is 687853993. The next prime is 687853997. The reversal of 687853994 is 499358786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (687853993) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606922 + ... + 1607349.

It is an arithmetic number, because the mean of its divisors is an integer number (130178016).

Almost surely, 2^687853994 is an apocalyptic number.

687853994 is a deficient number, since it is larger than the sum of its proper divisors (353570134).

687853994 is a wasteful number, since it uses less digits than its factorization.

687853994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3214380.

The product of its digits is 13063680, while the sum is 59.

The square root of 687853994 is about 26226.9707362478. The cubic root of 687853994 is about 882.7385393098.

The spelling of 687853994 in words is "six hundred eighty-seven million, eight hundred fifty-three thousand, nine hundred ninety-four".