687537849 has 4 divisors (see below), whose sum is σ = 916717136. Its totient is φ = 458358564.

The previous prime is 687537841. The next prime is 687537863. The reversal of 687537849 is 948735786.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 687537849 - 2³ = 687537841 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (687537841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114589639 + ... + 114589644.

It is an arithmetic number, because the mean of its divisors is an integer number (229179284).

Almost surely, 2^687537849 is an apocalyptic number.

It is an amenable number.

687537849 is a deficient number, since it is larger than the sum of its proper divisors (229179287).

687537849 is a wasteful number, since it uses less digits than its factorization.

687537849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229179286.

The product of its digits is 10160640, while the sum is 57.

The square root of 687537849 is about 26220.9429464312. The cubic root of 687537849 is about 882.6032799166.

The spelling of 687537849 in words is "six hundred eighty-seven million, five hundred thirty-seven thousand, eight hundred forty-nine".