685635722 has 4 divisors (see below), whose sum is σ = 1028453586. Its totient is φ = 342817860.

The previous prime is 685635689. The next prime is 685635733. The reversal of 685635722 is 227536586.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 455779801 + 229855921 = 21349^2 + 15161^2 .

It is a super-2 number, since 2×685635722² = 940192686564922568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171408929 + ... + 171408932.

Almost surely, 2^685635722 is an apocalyptic number.

685635722 is a deficient number, since it is larger than the sum of its proper divisors (342817864).

685635722 is a wasteful number, since it uses less digits than its factorization.

685635722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342817863.

The product of its digits is 604800, while the sum is 44.

The square root of 685635722 is about 26184.6466846509. The cubic root of 685635722 is about 881.7885979254.

The spelling of 685635722 in words is "six hundred eighty-five million, six hundred thirty-five thousand, seven hundred twenty-two".