687479 has 4 divisors (see below), whose sum is σ = 740376. Its totient is φ = 634584.

The previous prime is 687473. The next prime is 687481. The reversal of 687479 is 974786.

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 687479 - 2⁸ = 687223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687473) 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, 26429 + ... + 26454.

It is an arithmetic number, because the mean of its divisors is an integer number (185094).

2⁶⁸⁷⁴⁷⁹ is an apocalyptic number.

687479 is a deficient number, since it is larger than the sum of its proper divisors (52897).

687479 is a wasteful number, since it uses less digits than its factorization.

687479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52896.

The product of its digits is 84672, while the sum is 41.

The square root of 687479 is about 829.1435340157. The cubic root of 687479 is about 88.2578097399.

The spelling of 687479 in words is "six hundred eighty-seven thousand, four hundred seventy-nine".