685476993 has 4 divisors (see below), whose sum is σ = 913969328. Its totient is φ = 456984660.

The previous prime is 685476949. The next prime is 685477007. The reversal of 685476993 is 399674586.

It is a happy number.

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 685476993 - 2⁹ = 685476481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (685476293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114246163 + ... + 114246168.

It is an arithmetic number, because the mean of its divisors is an integer number (228492332).

Almost surely, 2^685476993 is an apocalyptic number.

It is an amenable number.

685476993 is a deficient number, since it is larger than the sum of its proper divisors (228492335).

685476993 is a wasteful number, since it uses less digits than its factorization.

685476993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228492334.

The product of its digits is 9797760, while the sum is 57.

The square root of 685476993 is about 26181.6155536667. The cubic root of 685476993 is about 881.7205461304.

The spelling of 685476993 in words is "six hundred eighty-five million, four hundred seventy-six thousand, nine hundred ninety-three".