687800816 has 20 divisors (see below), whose sum is σ = 1333469712. Its totient is φ = 343679616.

The previous prime is 687800797. The next prime is 687800843. The reversal of 687800816 is 618008786.

687800816 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13541 + ... + 39483.

Almost surely, 2^687800816 is an apocalyptic number.

It is an amenable number.

687800816 is a deficient number, since it is larger than the sum of its proper divisors (645668896).

687800816 is a wasteful number, since it uses less digits than its factorization.

687800816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27608 (or 27602 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 687800816 is about 26225.9569129517. The cubic root of 687800816 is about 882.7157905481.

The spelling of 687800816 in words is "six hundred eighty-seven million, eight hundred thousand, eight hundred sixteen".