688819497 has 8 divisors (see below), whose sum is σ = 918721344. Its totient is φ = 459065328.

The previous prime is 688819489. The next prime is 688819517. The reversal of 688819497 is 794918886.

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

It is not a de Polignac number, because 688819497 - 2³ = 688819489 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 688819497.

It is not an unprimeable number, because it can be changed into a prime (688819427) 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, 25533 + ... + 45050.

It is an arithmetic number, because the mean of its divisors is an integer number (114840168).

Almost surely, 2^688819497 is an apocalyptic number.

It is an amenable number.

688819497 is a deficient number, since it is larger than the sum of its proper divisors (229901847).

688819497 is a wasteful number, since it uses less digits than its factorization.

688819497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73839.

The product of its digits is 6967296, while the sum is 60.

The square root of 688819497 is about 26245.3709632766. The cubic root of 688819497 is about 883.1513634734.

The spelling of 688819497 in words is "six hundred eighty-eight million, eight hundred nineteen thousand, four hundred ninety-seven".