687973913 has 8 divisors (see below), whose sum is σ = 751558080. Its totient is φ = 624563280.

The previous prime is 687973903. The next prime is 687973927. The reversal of 687973913 is 319379786.

It is a happy number.

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

It is not a de Polignac number, because 687973913 - 2²² = 683779609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687973903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35018 + ... + 51011.

It is an arithmetic number, because the mean of its divisors is an integer number (93944760).

Almost surely, 2^687973913 is an apocalyptic number.

It is an amenable number.

687973913 is a deficient number, since it is larger than the sum of its proper divisors (63584167).

687973913 is a wasteful number, since it uses less digits than its factorization.

687973913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86767.

The product of its digits is 1714608, while the sum is 53.

The square root of 687973913 is about 26229.2568137185. The cubic root of 687973913 is about 882.7898345812.

It can be divided in two parts, 687973 and 913, that added together give a palindrome (688886).

The spelling of 687973913 in words is "six hundred eighty-seven million, nine hundred seventy-three thousand, nine hundred thirteen".