687538943 has 12 divisors (see below), whose sum is σ = 861313320. Its totient is φ = 543986352.

The previous prime is 687538927. The next prime is 687538979. The reversal of 687538943 is 349835786.

It is not a de Polignac number, because 687538943 - 2⁴ = 687538927 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687538903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 539033 + ... + 540306.

It is an arithmetic number, because the mean of its divisors is an integer number (71776110).

Almost surely, 2^687538943 is an apocalyptic number.

687538943 is a deficient number, since it is larger than the sum of its proper divisors (173774377).

687538943 is a wasteful number, since it uses less digits than its factorization.

687538943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1079366 (or 1079359 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 53.

The square root of 687538943 is about 26220.9638076101. The cubic root of 687538943 is about 882.6037480448.

The spelling of 687538943 in words is "six hundred eighty-seven million, five hundred thirty-eight thousand, nine hundred forty-three".