687766369 has 8 divisors (see below), whose sum is σ = 703772928. Its totient is φ = 671817120.

The previous prime is 687766357. The next prime is 687766411. The reversal of 687766369 is 963667786.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 687766369 - 2⁷ = 687766241 is a prime.

It is a super-2 number, since 2×687766369² = 946045156654888322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687766169) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10444 + ... + 38530.

It is an arithmetic number, because the mean of its divisors is an integer number (87971616).

Almost surely, 2^687766369 is an apocalyptic number.

It is an amenable number.

687766369 is a deficient number, since it is larger than the sum of its proper divisors (16006559).

687766369 is a wasteful number, since it uses less digits than its factorization.

687766369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28655.

The product of its digits is 13716864, while the sum is 58.

The square root of 687766369 is about 26225.3001698741. The cubic root of 687766369 is about 882.7010540053.

The spelling of 687766369 in words is "six hundred eighty-seven million, seven hundred sixty-six thousand, three hundred sixty-nine".