689750257 has 8 divisors (see below), whose sum is σ = 807512832. Its totient is φ = 576794400.

The previous prime is 689750249. The next prime is 689750261. The reversal of 689750257 is 752057986.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 689750257 - 2³ = 689750249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689750257.

It is not an unprimeable number, because it can be changed into a prime (689750207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1201369 + ... + 1201942.

It is an arithmetic number, because the mean of its divisors is an integer number (100939104).

Almost surely, 2^689750257 is an apocalyptic number.

It is an amenable number.

689750257 is a deficient number, since it is larger than the sum of its proper divisors (117762575).

689750257 is a wasteful number, since it uses less digits than its factorization.

689750257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2403359.

The product of its (nonzero) digits is 1058400, while the sum is 49.

The square root of 689750257 is about 26263.0968661352. The cubic root of 689750257 is about 883.5489673952.

The spelling of 689750257 in words is "six hundred eighty-nine million, seven hundred fifty thousand, two hundred fifty-seven".