687378775 has 6 divisors (see below), whose sum is σ = 852349712. Its totient is φ = 549903000.

The previous prime is 687378767. The next prime is 687378781. The reversal of 687378775 is 577873786.

687378775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 687378775 - 2³ = 687378767 is a prime.

It is a Duffinian number.

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, 13747551 + ... + 13747600.

Almost surely, 2^687378775 is an apocalyptic number.

687378775 is a deficient number, since it is larger than the sum of its proper divisors (164970937).

687378775 is a wasteful number, since it uses less digits than its factorization.

687378775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27495161 (or 27495156 counting only the distinct ones).

The product of its digits is 13829760, while the sum is 58.

The square root of 687378775 is about 26217.9094322946. The cubic root of 687378775 is about 882.5352060578.

The spelling of 687378775 in words is "six hundred eighty-seven million, three hundred seventy-eight thousand, seven hundred seventy-five".