687075679 has 4 divisors (see below), whose sum is σ = 687132576. Its totient is φ = 687018784.

The previous prime is 687075677. The next prime is 687075691. The reversal of 687075679 is 976570786.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 687075679 - 2¹ = 687075677 is a prime.

It is a super-2 number, since 2×687075679² = 944145977346622082, 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 (687075673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2359 + ... + 37144.

It is an arithmetic number, because the mean of its divisors is an integer number (171783144).

Almost surely, 2^687075679 is an apocalyptic number.

687075679 is a deficient number, since it is larger than the sum of its proper divisors (56897).

687075679 is a wasteful number, since it uses less digits than its factorization.

687075679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56896.

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

The square root of 687075679 is about 26212.1284713775. The cubic root of 687075679 is about 882.4054705918.

The spelling of 687075679 in words is "six hundred eighty-seven million, seventy-five thousand, six hundred seventy-nine".