687907983 has 16 divisors (see below), whose sum is σ = 1049120000. Its totient is φ = 392760576.

The previous prime is 687907931. The next prime is 687907991. The reversal of 687907983 is 389709786.

It is a Cunningham number, because it is equal to 26228²-1.

It is not a de Polignac number, because 687907983 - 2¹³ = 687899791 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687907783) 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 15 ways as a sum of consecutive naturals, for example, 13116 + ... + 39342.

It is an arithmetic number, because the mean of its divisors is an integer number (65570000).

Almost surely, 2^687907983 is an apocalyptic number.

687907983 is a deficient number, since it is larger than the sum of its proper divisors (361212017).

687907983 is a wasteful number, since it uses less digits than its factorization.

687907983 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27486.

The product of its (nonzero) digits is 4572288, while the sum is 57.

The square root of 687907983 is about 26227.9999809364. Note that the first 4 decimals coincide. The cubic root of 687907983 is about 882.7616338059.

The spelling of 687907983 in words is "six hundred eighty-seven million, nine hundred seven thousand, nine hundred eighty-three".