688143454 has 8 divisors (see below), whose sum is σ = 1032333840. Its totient is φ = 344032176.

The previous prime is 688143437. The next prime is 688143499. The reversal of 688143454 is 454341886.

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

It is a self number, because there is not a number n which added to its sum of digits gives 688143454.

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 in 3 ways as a sum of consecutive naturals, for example, 12522 + ... + 39154.

It is an arithmetic number, because the mean of its divisors is an integer number (129041730).

Almost surely, 2^688143454 is an apocalyptic number.

688143454 is a deficient number, since it is larger than the sum of its proper divisors (344190386).

688143454 is a wasteful number, since it uses less digits than its factorization.

688143454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39554.

The product of its digits is 368640, while the sum is 43.

The square root of 688143454 is about 26232.4885209162. The cubic root of 688143454 is about 882.8623454597.

The spelling of 688143454 in words is "six hundred eighty-eight million, one hundred forty-three thousand, four hundred fifty-four".