687878757 has 16 divisors (see below), whose sum is σ = 1020799360. Its totient is φ = 457812000.

The previous prime is 687878707. The next prime is 687878797. The reversal of 687878757 is 757878786.

It is not a de Polignac number, because 687878757 - 2⁶ = 687878693 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 687878694 and 687878703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687878707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4969 + ... + 37422.

It is an arithmetic number, because the mean of its divisors is an integer number (63799960).

Almost surely, 2^687878757 is an apocalyptic number.

It is an amenable number.

687878757 is a deficient number, since it is larger than the sum of its proper divisors (332920603).

687878757 is a wasteful number, since it uses less digits than its factorization.

687878757 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43001 (or 42995 counting only the distinct ones).

The product of its digits is 36879360, while the sum is 63.

The square root of 687878757 is about 26227.4428223569. The cubic root of 687878757 is about 882.7491321548.

The spelling of 687878757 in words is "six hundred eighty-seven million, eight hundred seventy-eight thousand, seven hundred fifty-seven".