687757069 has 8 divisors (see below), whose sum is σ = 712328760. Its totient is φ = 663242496.

The previous prime is 687757027. The next prime is 687757129. The reversal of 687757069 is 960757786.

It can be written as a sum of positive squares in 4 ways, for example, as 65853225 + 621903844 = 8115^2 + 24938^2 .

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 687757069 - 2⁷ = 687756941 is a prime.

It is a super-2 number, since 2×687757069² = 946019571918941522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687757019) 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 7 ways as a sum of consecutive naturals, for example, 11017 + ... + 38689.

It is an arithmetic number, because the mean of its divisors is an integer number (89041095).

Almost surely, 2^687757069 is an apocalyptic number.

It is an amenable number.

687757069 is a deficient number, since it is larger than the sum of its proper divisors (24571691).

687757069 is a wasteful number, since it uses less digits than its factorization.

687757069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28559.

The product of its (nonzero) digits is 4445280, while the sum is 55.

The square root of 687757069 is about 26225.1228595788. The cubic root of 687757069 is about 882.6970753496.

The spelling of 687757069 in words is "six hundred eighty-seven million, seven hundred fifty-seven thousand, sixty-nine".