688894457 has 8 divisors (see below), whose sum is σ = 734332800. Its totient is φ = 644374224.

The previous prime is 688894433. The next prime is 688894487. The reversal of 688894457 is 754498886.

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

It is a cyclic number.

It is not a de Polignac number, because 688894457 - 2¹² = 688890361 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 688894396 and 688894405.

It is not an unprimeable number, because it can be changed into a prime (688894487) 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 7 ways as a sum of consecutive naturals, for example, 227978 + ... + 230979.

It is an arithmetic number, because the mean of its divisors is an integer number (91791600).

Almost surely, 2^688894457 is an apocalyptic number.

It is an amenable number.

688894457 is a deficient number, since it is larger than the sum of its proper divisors (45438343).

688894457 is a wasteful number, since it uses less digits than its factorization.

688894457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459055.

The product of its digits is 15482880, while the sum is 59.

The square root of 688894457 is about 26246.7989857811. The cubic root of 688894457 is about 883.1833982929.

The spelling of 688894457 in words is "six hundred eighty-eight million, eight hundred ninety-four thousand, four hundred fifty-seven".