687678678 has 12 divisors (see below), whose sum is σ = 1489970508. Its totient is φ = 229226220.

The previous prime is 687678659. The next prime is 687678697. The reversal of 687678678 is 876876786.

It is an interprime number because it is at equal distance from previous prime (687678659) and next prime (687678697).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19102168 + ... + 19102203.

It is an arithmetic number, because the mean of its divisors is an integer number (124164209).

Almost surely, 2^687678678 is an apocalyptic number.

687678678 is an abundant number, since it is smaller than the sum of its proper divisors (802291830).

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

687678678 is a wasteful number, since it uses less digits than its factorization.

687678678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38204379 (or 38204376 counting only the distinct ones).

The product of its digits is 37933056, while the sum is 63.

The square root of 687678678 is about 26223.6282386706. The cubic root of 687678678 is about 882.6635372789.

The spelling of 687678678 in words is "six hundred eighty-seven million, six hundred seventy-eight thousand, six hundred seventy-eight".