687717399 has 4 divisors (see below), whose sum is σ = 916956536. Its totient is φ = 458478264.

The previous prime is 687717377. The next prime is 687717461. The reversal of 687717399 is 993717786.

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

It is not a de Polignac number, because 687717399 - 2⁷ = 687717271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687717799) 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, 114619564 + ... + 114619569.

It is an arithmetic number, because the mean of its divisors is an integer number (229239134).

Almost surely, 2^687717399 is an apocalyptic number.

687717399 is a deficient number, since it is larger than the sum of its proper divisors (229239137).

687717399 is a wasteful number, since it uses less digits than its factorization.

687717399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229239136.

The product of its digits is 4000752, while the sum is 57.

The square root of 687717399 is about 26224.3665128445. The cubic root of 687717399 is about 882.6801036271.

The spelling of 687717399 in words is "six hundred eighty-seven million, seven hundred seventeen thousand, three hundred ninety-nine".