686996867 has 4 divisors (see below), whose sum is σ = 716866320. Its totient is φ = 657127416.

The previous prime is 686996857. The next prime is 686996873. The reversal of 686996867 is 768699686.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686996867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686996837) 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, 14934692 + ... + 14934737.

It is an arithmetic number, because the mean of its divisors is an integer number (179216580).

Almost surely, 2^686996867 is an apocalyptic number.

686996867 is a deficient number, since it is larger than the sum of its proper divisors (29869453).

686996867 is a wasteful number, since it uses less digits than its factorization.

686996867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29869452.

The product of its digits is 47029248, while the sum is 65.

The square root of 686996867 is about 26210.6250783914. The cubic root of 686996867 is about 882.3717301072.

The spelling of 686996867 in words is "six hundred eighty-six million, nine hundred ninety-six thousand, eight hundred sixty-seven".