686896387 has 8 divisors (see below), whose sum is σ = 697103712. Its totient is φ = 676704000.

The previous prime is 686896381. The next prime is 686896421. The reversal of 686896387 is 783698686.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686896387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686896381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117637 + ... + 123337.

It is an arithmetic number, because the mean of its divisors is an integer number (87137964).

Almost surely, 2^686896387 is an apocalyptic number.

686896387 is a deficient number, since it is larger than the sum of its proper divisors (10207325).

686896387 is a wasteful number, since it uses less digits than its factorization.

686896387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7469.

The product of its digits is 20901888, while the sum is 61.

The square root of 686896387 is about 26208.7082283733. The cubic root of 686896387 is about 882.3287095159.

It can be divided in two parts, 68689 and 6387, that added together give a square (75076 = 274²).

The spelling of 686896387 in words is "six hundred eighty-six million, eight hundred ninety-six thousand, three hundred eighty-seven".