689339257 has 4 divisors (see below), whose sum is σ = 690848116. Its totient is φ = 687830400.

The previous prime is 689339249. The next prime is 689339317. The reversal of 689339257 is 752933986.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 467597376 + 221741881 = 21624^2 + 14891^2 .

It is a cyclic number.

It is not a de Polignac number, because 689339257 - 2³ = 689339249 is a prime.

It is a super-2 number, since 2×689339257² = 950377222482624098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689339237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753744 + ... + 754657.

It is an arithmetic number, because the mean of its divisors is an integer number (172712029).

Almost surely, 2^689339257 is an apocalyptic number.

It is an amenable number.

689339257 is a deficient number, since it is larger than the sum of its proper divisors (1508859).

689339257 is a wasteful number, since it uses less digits than its factorization.

689339257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1508858.

The product of its digits is 2449440, while the sum is 52.

The square root of 689339257 is about 26255.2710326898. The cubic root of 689339257 is about 883.3734397201.

The spelling of 689339257 in words is "six hundred eighty-nine million, three hundred thirty-nine thousand, two hundred fifty-seven".