687870 has 24 divisors (see below), whose sum is σ = 1788696. Its totient is φ = 183408.

The previous prime is 687847. The next prime is 687893. The reversal of 687870 is 78786.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (687847) and next prime (687893).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 687870.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3732 + ... + 3911.

It is an arithmetic number, because the mean of its divisors is an integer number (74529).

2⁶⁸⁷⁸⁷⁰ is an apocalyptic number.

687870 is an abundant number, since it is smaller than the sum of its proper divisors (1100826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687870 is a wasteful number, since it uses less digits than its factorization.

687870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7656 (or 7653 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 687870 is about 829.3792859723. The cubic root of 687870 is about 88.2745386210.

The spelling of 687870 in words is "six hundred eighty-seven thousand, eight hundred seventy".