687829878 has 12 divisors (see below), whose sum is σ = 1490298108. Its totient is φ = 229276620.

The previous prime is 687829873. The next prime is 687829907. The reversal of 687829878 is 878928786.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687829873) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19106368 + ... + 19106403.

It is an arithmetic number, because the mean of its divisors is an integer number (124191509).

Almost surely, 2^687829878 is an apocalyptic number.

687829878 is an abundant number, since it is smaller than the sum of its proper divisors (802468230).

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

687829878 is a wasteful number, since it uses less digits than its factorization.

687829878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38212779 (or 38212776 counting only the distinct ones).

The product of its digits is 21676032, while the sum is 63.

The square root of 687829878 is about 26226.5109764909. The cubic root of 687829878 is about 882.7282229871.

The spelling of 687829878 in words is "six hundred eighty-seven million, eight hundred twenty-nine thousand, eight hundred seventy-eight".