689742008 has 8 divisors (see below), whose sum is σ = 1293266280. Its totient is φ = 344871000.

The previous prime is 689742007. The next prime is 689742013. The reversal of 689742008 is 800247986.

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

It is a self number, because there is not a number n which added to its sum of digits gives 689742008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689742007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43108868 + ... + 43108883.

It is an arithmetic number, because the mean of its divisors is an integer number (161658285).

Almost surely, 2^689742008 is an apocalyptic number.

It is an amenable number.

689742008 is a deficient number, since it is larger than the sum of its proper divisors (603524272).

689742008 is a wasteful number, since it uses less digits than its factorization.

689742008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86217757 (or 86217753 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 689742008 is about 26262.9398202105. The cubic root of 689742008 is about 883.5454451423.

The spelling of 689742008 in words is "six hundred eighty-nine million, seven hundred forty-two thousand, eight".