689690312 has 8 divisors (see below), whose sum is σ = 1293169350. Its totient is φ = 344845152.

The previous prime is 689690311. The next prime is 689690321. The reversal of 689690312 is 213096986.

689690312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 345439396 + 344250916 = 18586^2 + 18554^2 .

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

It is not an unprimeable number, because it can be changed into a prime (689690311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43105637 + ... + 43105652.

Almost surely, 2^689690312 is an apocalyptic number.

It is an amenable number.

689690312 is a deficient number, since it is larger than the sum of its proper divisors (603479038).

689690312 is a wasteful number, since it uses less digits than its factorization.

689690312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86211295 (or 86211291 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 689690312 is about 26261.9556012114. The cubic root of 689690312 is about 883.5233707502.

The spelling of 689690312 in words is "six hundred eighty-nine million, six hundred ninety thousand, three hundred twelve".