685508822 has 4 divisors (see below), whose sum is σ = 1028263236. Its totient is φ = 342754410.

The previous prime is 685508821. The next prime is 685508839. The reversal of 685508822 is 228805586.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 228805586 = 2 ⋅114402793.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685508821) 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 as a sum of consecutive naturals, namely, 171377204 + ... + 171377207.

It is an arithmetic number, because the mean of its divisors is an integer number (257065809).

Almost surely, 2^685508822 is an apocalyptic number.

685508822 is a deficient number, since it is larger than the sum of its proper divisors (342754414).

685508822 is a wasteful number, since it uses less digits than its factorization.

685508822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342754413.

The product of its (nonzero) digits is 307200, while the sum is 44.

The square root of 685508822 is about 26182.2233968011. The cubic root of 685508822 is about 881.7341930017.

The spelling of 685508822 in words is "six hundred eighty-five million, five hundred eight thousand, eight hundred twenty-two".