687539493 has 12 divisors (see below), whose sum is σ = 994694688. Its totient is φ = 457629480.

The previous prime is 687539473. The next prime is 687539539. The reversal of 687539493 is 394935786.

687539493 is a `hidden beast` number, since 68 + 7 + 539 + 49 + 3 = 666.

It is not a de Polignac number, because 687539493 - 2¹⁰ = 687538469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687539473) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54855 + ... + 66212.

It is an arithmetic number, because the mean of its divisors is an integer number (82891224).

Almost surely, 2^687539493 is an apocalyptic number.

It is an amenable number.

687539493 is a deficient number, since it is larger than the sum of its proper divisors (307155195).

687539493 is a wasteful number, since it uses less digits than its factorization.

687539493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121704 (or 121701 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 54.

The square root of 687539493 is about 26220.9742953995. The cubic root of 687539493 is about 882.6039833924.

The spelling of 687539493 in words is "six hundred eighty-seven million, five hundred thirty-nine thousand, four hundred ninety-three".