687879871 has 8 divisors (see below), whose sum is σ = 786362400. Its totient is φ = 589450848.

The previous prime is 687879869. The next prime is 687879889. The reversal of 687879871 is 178978786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 687879871 - 2¹ = 687879869 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 (687874871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19605 + ... + 41953.

It is an arithmetic number, because the mean of its divisors is an integer number (98295300).

Almost surely, 2^687879871 is an apocalyptic number.

687879871 is a deficient number, since it is larger than the sum of its proper divisors (98482529).

687879871 is a wasteful number, since it uses less digits than its factorization.

687879871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26753.

The product of its digits is 9483264, while the sum is 61.

The square root of 687879871 is about 26227.4640596456. The cubic root of 687879871 is about 882.7496086835.

The spelling of 687879871 in words is "six hundred eighty-seven million, eight hundred seventy-nine thousand, eight hundred seventy-one".