687149062879 has 4 divisors (see below), whose sum is σ = 687842453440. Its totient is φ = 686455672320.

The previous prime is 687149062753. The next prime is 687149062973. The reversal of 687149062879 is 978260941786.

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

It is a cyclic number.

It is not a de Polignac number, because 687149062879 - 2²⁷ = 687014845151 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 (687149063879) 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, 346693794 + ... + 346695775.

It is an arithmetic number, because the mean of its divisors is an integer number (171960613360).

Almost surely, 2^687149062879 is an apocalyptic number.

687149062879 is a deficient number, since it is larger than the sum of its proper divisors (693390561).

687149062879 is an equidigital number, since it uses as much as digits as its factorization.

687149062879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693390560.

The product of its (nonzero) digits is 73156608, while the sum is 67.

The spelling of 687149062879 in words is "six hundred eighty-seven billion, one hundred forty-nine million, sixty-two thousand, eight hundred seventy-nine".