687939799 has 8 divisors (see below), whose sum is σ = 743905728. Its totient is φ = 633696000.

The previous prime is 687939787. The next prime is 687939839. The reversal of 687939799 is 997939786.

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 687939799 - 2⁵ = 687939767 is a prime.

It is a super-2 number, since 2×687939799² = 946522334096320802, 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 (687939199) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 429702 + ... + 431299.

It is an arithmetic number, because the mean of its divisors is an integer number (92988216).

Almost surely, 2^687939799 is an apocalyptic number.

687939799 is a deficient number, since it is larger than the sum of its proper divisors (55965929).

687939799 is a wasteful number, since it uses less digits than its factorization.

687939799 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861065.

The product of its digits is 46294416, while the sum is 67.

The square root of 687939799 is about 26228.6065012993. The cubic root of 687939799 is about 882.7752429474.

The spelling of 687939799 in words is "six hundred eighty-seven million, nine hundred thirty-nine thousand, seven hundred ninety-nine".