688897 has 4 divisors (see below), whose sum is σ = 751536. Its totient is φ = 626260.

The previous prime is 688889. The next prime is 688907. The reversal of 688897 is 798886.

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 688897 - 2³ = 688889 is a prime.

It is a Duffinian number.

688897 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (688867) 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, 31303 + ... + 31324.

It is an arithmetic number, because the mean of its divisors is an integer number (187884).

2⁶⁸⁸⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

688897 is a deficient number, since it is larger than the sum of its proper divisors (62639).

688897 is a wasteful number, since it uses less digits than its factorization.

688897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62638.

The product of its digits is 193536, while the sum is 46.

The square root of 688897 is about 829.9981927691. The cubic root of 688897 is about 88.3184485026.

The spelling of 688897 in words is "six hundred eighty-eight thousand, eight hundred ninety-seven".