688891853 has 4 divisors (see below), whose sum is σ = 741883548. Its totient is φ = 635900160.

The previous prime is 688891829. The next prime is 688891859. The reversal of 688891853 is 358198886.

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 121594729 + 567297124 = 11027^2 + 23818^2 .

It is a cyclic number.

It is not a de Polignac number, because 688891853 - 2¹² = 688887757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688891859) 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, 26495828 + ... + 26495853.

It is an arithmetic number, because the mean of its divisors is an integer number (185470887).

Almost surely, 2^688891853 is an apocalyptic number.

It is an amenable number.

688891853 is a deficient number, since it is larger than the sum of its proper divisors (52991695).

688891853 is a wasteful number, since it uses less digits than its factorization.

688891853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52991694.

The product of its digits is 3317760, while the sum is 56.

The square root of 688891853 is about 26246.7493796851. The cubic root of 688891853 is about 883.1822854895.

The spelling of 688891853 in words is "six hundred eighty-eight million, eight hundred ninety-one thousand, eight hundred fifty-three".