688819253 has 4 divisors (see below), whose sum is σ = 688871820. Its totient is φ = 688766688.

The previous prime is 688819247. The next prime is 688819291. The reversal of 688819253 is 352918886.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 352918886 = 2 ⋅176459443.

It can be written as a sum of positive squares in 2 ways, for example, as 18164644 + 670654609 = 4262^2 + 25897^2 .

It is a cyclic number.

It is not a de Polignac number, because 688819253 - 2⁶ = 688819189 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 (688819553) 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 3 ways as a sum of consecutive naturals, for example, 11033 + ... + 38721.

It is an arithmetic number, because the mean of its divisors is an integer number (172217955).

Almost surely, 2^688819253 is an apocalyptic number.

It is an amenable number.

688819253 is a deficient number, since it is larger than the sum of its proper divisors (52567).

688819253 is a wasteful number, since it uses less digits than its factorization.

688819253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52566.

The product of its digits is 829440, while the sum is 50.

The square root of 688819253 is about 26245.3663148374. The cubic root of 688819253 is about 883.1512591940.

The spelling of 688819253 in words is "six hundred eighty-eight million, eight hundred nineteen thousand, two hundred fifty-three".