688358494 has 4 divisors (see below), whose sum is σ = 1032537744. Its totient is φ = 344179246.

The previous prime is 688358483. The next prime is 688358501. The reversal of 688358494 is 494853886.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 172089622 + ... + 172089625.

It is an arithmetic number, because the mean of its divisors is an integer number (258134436).

Almost surely, 2^688358494 is an apocalyptic number.

688358494 is a deficient number, since it is larger than the sum of its proper divisors (344179250).

688358494 is a wasteful number, since it uses less digits than its factorization.

688358494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344179249.

The product of its digits is 6635520, while the sum is 55.

The square root of 688358494 is about 26236.5869350417. The cubic root of 688358494 is about 882.9542986444.

The spelling of 688358494 in words is "six hundred eighty-eight million, three hundred fifty-eight thousand, four hundred ninety-four".