689960257 has 16 divisors (see below), whose sum is σ = 819187200. Its totient is φ = 568572480.

The previous prime is 689960251. The next prime is 689960287. The reversal of 689960257 is 752069986.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-689960257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689960251) 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, 41407 + ... + 55627.

It is an arithmetic number, because the mean of its divisors is an integer number (51199200).

Almost surely, 2^689960257 is an apocalyptic number.

It is an amenable number.

689960257 is a deficient number, since it is larger than the sum of its proper divisors (129226943).

689960257 is a wasteful number, since it uses less digits than its factorization.

689960257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14496.

The product of its (nonzero) digits is 1632960, while the sum is 52.

The square root of 689960257 is about 26267.0945671576. The cubic root of 689960257 is about 883.6386261541.

The spelling of 689960257 in words is "six hundred eighty-nine million, nine hundred sixty thousand, two hundred fifty-seven".