687850393 has 4 divisors (see below), whose sum is σ = 696557440. Its totient is φ = 679143348.

The previous prime is 687850367. The next prime is 687850411. The reversal of 687850393 is 393058786.

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 a cyclic number.

It is not a de Polignac number, because 687850393 - 2⁹ = 687849881 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687850193) 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, 4353405 + ... + 4353562.

It is an arithmetic number, because the mean of its divisors is an integer number (174139360).

Almost surely, 2^687850393 is an apocalyptic number.

It is an amenable number.

687850393 is a deficient number, since it is larger than the sum of its proper divisors (8707047).

687850393 is an equidigital number, since it uses as much as digits as its factorization.

687850393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8707046.

The product of its (nonzero) digits is 1088640, while the sum is 49.

The square root of 687850393 is about 26226.9020854542. The cubic root of 687850393 is about 882.7369988923.

The spelling of 687850393 in words is "six hundred eighty-seven million, eight hundred fifty thousand, three hundred ninety-three".