689154728 has 8 divisors (see below), whose sum is σ = 1292165130. Its totient is φ = 344577360.

The previous prime is 689154703. The next prime is 689154731. The reversal of 689154728 is 827451986.

It can be written as a sum of positive squares in only one way, i.e., 628906084 + 60248644 = 25078^2 + 7762^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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, 43072163 + ... + 43072178.

Almost surely, 2^689154728 is an apocalyptic number.

It is an amenable number.

689154728 is a deficient number, since it is larger than the sum of its proper divisors (603010402).

689154728 is a wasteful number, since it uses less digits than its factorization.

689154728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86144347 (or 86144343 counting only the distinct ones).

The product of its digits is 967680, while the sum is 50.

The square root of 689154728 is about 26251.7566650310. The cubic root of 689154728 is about 883.2946093700.

The spelling of 689154728 in words is "six hundred eighty-nine million, one hundred fifty-four thousand, seven hundred twenty-eight".