687740873 has 4 divisors (see below), whose sum is σ = 687837648. Its totient is φ = 687644100.

The previous prime is 687740869. The next prime is 687740881. The reversal of 687740873 is 378047786.

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, and also an emirpimes, since its reverse is a distinct semiprime: 378047786 = 2 ⋅189023893.

It is a cyclic number.

It is not a de Polignac number, because 687740873 - 2² = 687740869 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687740843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36803 + ... + 52248.

It is an arithmetic number, because the mean of its divisors is an integer number (171959412).

Almost surely, 2^687740873 is an apocalyptic number.

It is an amenable number.

687740873 is a deficient number, since it is larger than the sum of its proper divisors (96775).

687740873 is an equidigital number, since it uses as much as digits as its factorization.

687740873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96774.

The product of its (nonzero) digits is 1580544, while the sum is 50.

The square root of 687740873 is about 26224.8140698843. The cubic root of 687740873 is about 882.6901464136.

The spelling of 687740873 in words is "six hundred eighty-seven million, seven hundred forty thousand, eight hundred seventy-three".