687539494 has 8 divisors (see below), whose sum is σ = 1031463720. Its totient is φ = 343718256.

The previous prime is 687539473. The next prime is 687539539. The reversal of 687539494 is 494935786.

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

It is a congruent number.

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, 6039 + ... + 37570.

It is an arithmetic number, because the mean of its divisors is an integer number (128932965).

Almost surely, 2^687539494 is an apocalyptic number.

687539494 is a deficient number, since it is larger than the sum of its proper divisors (343924226).

687539494 is a wasteful number, since it uses less digits than its factorization.

687539494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51494.

The product of its digits is 6531840, while the sum is 55.

The square root of 687539494 is about 26220.9743144682. The cubic root of 687539494 is about 882.6039838203.

The spelling of 687539494 in words is "six hundred eighty-seven million, five hundred thirty-nine thousand, four hundred ninety-four".