687426977 has 6 divisors (see below), whose sum is σ = 727978338. Its totient is φ = 646888352.

The previous prime is 687426937. The next prime is 687427007. The reversal of 687426977 is 779624786.

687426977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 646990096 + 40436881 = 25436^2 + 6359^2 .

It is a de Polignac number, because none of the positive numbers 2^k-687426977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687426937) 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, 104924 + ... + 111282.

It is an arithmetic number, because the mean of its divisors is an integer number (121329723).

Almost surely, 2^687426977 is an apocalyptic number.

It is an amenable number.

687426977 is a deficient number, since it is larger than the sum of its proper divisors (40551361).

687426977 is an frugal number, since it uses more digits than its factorization.

687426977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12735 (or 6376 counting only the distinct ones).

The product of its digits is 7112448, while the sum is 56.

The square root of 687426977 is about 26218.8286733027. The cubic root of 687426977 is about 882.5558346492. Note that the first 3 decimals are identical.

The spelling of 687426977 in words is "six hundred eighty-seven million, four hundred twenty-six thousand, nine hundred seventy-seven".