689728318 has 24 divisors (see below), whose sum is σ = 1103812272. Its totient is φ = 322118784.

The previous prime is 689728307. The next prime is 689728327. The reversal of 689728318 is 813827986.

It is a super-2 number, since 2×689728318² = 951450305302218248, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 837655 + ... + 838477.

It is an arithmetic number, because the mean of its divisors is an integer number (45992178).

Almost surely, 2^689728318 is an apocalyptic number.

689728318 is a deficient number, since it is larger than the sum of its proper divisors (414083954).

689728318 is a wasteful number, since it uses less digits than its factorization.

689728318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 999 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 52.

The square root of 689728318 is about 26262.6791854906. The cubic root of 689728318 is about 883.5395995667.

The spelling of 689728318 in words is "six hundred eighty-nine million, seven hundred twenty-eight thousand, three hundred eighteen".