687079 has 4 divisors (see below), whose sum is σ = 716976. Its totient is φ = 657184.

The previous prime is 687073. The next prime is 687083. The reversal of 687079 is 970786.

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 687079 - 2¹¹ = 685031 is a prime.

It is a Duffinian number.

687079 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687073) 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, 14914 + ... + 14959.

It is an arithmetic number, because the mean of its divisors is an integer number (179244).

2⁶⁸⁷⁰⁷⁹ is an apocalyptic number.

687079 is a deficient number, since it is larger than the sum of its proper divisors (29897).

687079 is a wasteful number, since it uses less digits than its factorization.

687079 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29896.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 687079 is about 828.9022861592. The cubic root of 687079 is about 88.2406892300.

The spelling of 687079 in words is "six hundred eighty-seven thousand, seventy-nine".