687777477 has 4 divisors (see below), whose sum is σ = 917036640. Its totient is φ = 458518316.

The previous prime is 687777469. The next prime is 687777481. The reversal of 687777477 is 774777786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 687777477 - 2³ = 687777469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 687777477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687777437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114629577 + ... + 114629582.

It is an arithmetic number, because the mean of its divisors is an integer number (229259160).

Almost surely, 2^687777477 is an apocalyptic number.

It is an amenable number.

687777477 is a deficient number, since it is larger than the sum of its proper divisors (229259163).

687777477 is a wasteful number, since it uses less digits than its factorization.

687777477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229259162.

The product of its digits is 22588608, while the sum is 60.

The square root of 687777477 is about 26225.5119492451. The cubic root of 687777477 is about 882.7058060989.

The spelling of 687777477 in words is "six hundred eighty-seven million, seven hundred seventy-seven thousand, four hundred seventy-seven".