689909697 has 16 divisors (see below), whose sum is σ = 1024063680. Its totient is φ = 459050976.

The previous prime is 689909651. The next prime is 689909699. The reversal of 689909697 is 796909986.

It is not a de Polignac number, because 689909697 - 2²⁶ = 622800833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689909699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10308 + ... + 38549.

It is an arithmetic number, because the mean of its divisors is an integer number (64003980).

Almost surely, 2^689909697 is an apocalyptic number.

It is an amenable number.

689909697 is a deficient number, since it is larger than the sum of its proper divisors (334153983).

689909697 is a wasteful number, since it uses less digits than its factorization.

689909697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49389 (or 49383 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 63.

The square root of 689909697 is about 26266.1321286557. The cubic root of 689909697 is about 883.6170414035.

It can be divided in two parts, 68990 and 9697, that added together give a palindrome (78687).

The spelling of 689909697 in words is "six hundred eighty-nine million, nine hundred nine thousand, six hundred ninety-seven".