687638939507 has 8 divisors (see below), whose sum is σ = 742183545600. Its totient is φ = 633329948160.

The previous prime is 687638939483. The next prime is 687638939509. The reversal of 687638939507 is 705939836786.

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

It is not a de Polignac number, because 687638939507 - 2³⁶ = 618919462771 is a prime.

It is a super-2 number, since 2×687638939507² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687638939509) 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 7 ways as a sum of consecutive naturals, for example, 58897619 + ... + 58909292.

It is an arithmetic number, because the mean of its divisors is an integer number (92772943200).

Almost surely, 2^687638939507 is an apocalyptic number.

687638939507 is a deficient number, since it is larger than the sum of its proper divisors (54544606093).

687638939507 is a wasteful number, since it uses less digits than its factorization.

687638939507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117807373.

The product of its (nonzero) digits is 411505920, while the sum is 71.

The spelling of 687638939507 in words is "six hundred eighty-seven billion, six hundred thirty-eight million, nine hundred thirty-nine thousand, five hundred seven".