687477 has 16 divisors (see below), whose sum is σ = 1103360. Its totient is φ = 371952.

The previous prime is 687473. The next prime is 687481. The reversal of 687477 is 774786.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (687473) and next prime (687481).

It is not a de Polignac number, because 687477 - 2² = 687473 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 (687473) 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 15 ways as a sum of consecutive naturals, for example, 463 + ... + 1260.

It is an arithmetic number, because the mean of its divisors is an integer number (68960).

2⁶⁸⁷⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

687477 is a deficient number, since it is larger than the sum of its proper divisors (415883).

687477 is a wasteful number, since it uses less digits than its factorization.

687477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752.

The product of its digits is 65856, while the sum is 39.

The square root of 687477 is about 829.1423279510. The cubic root of 687477 is about 88.2577241539.

The spelling of 687477 in words is "six hundred eighty-seven thousand, four hundred seventy-seven".