689288449 has 4 divisors (see below), whose sum is σ = 719257536. Its totient is φ = 659319364.

The previous prime is 689288407. The next prime is 689288473. The reversal of 689288449 is 944882986.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 689288449 - 2⁷ = 689288321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 689288393 and 689288402.

It is not an unprimeable number, because it can be changed into a prime (689283449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14984509 + ... + 14984554.

It is an arithmetic number, because the mean of its divisors is an integer number (179814384).

Almost surely, 2^689288449 is an apocalyptic number.

It is an amenable number.

689288449 is a deficient number, since it is larger than the sum of its proper divisors (29969087).

689288449 is a wasteful number, since it uses less digits than its factorization.

689288449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29969086.

The product of its digits is 7962624, while the sum is 58.

The square root of 689288449 is about 26254.3034377224. The cubic root of 689288449 is about 883.3517360669.

It can be divided in two parts, 68928 and 8449, that added together give a palindrome (77377).

The spelling of 689288449 in words is "six hundred eighty-nine million, two hundred eighty-eight thousand, four hundred forty-nine".