688429838 has 8 divisors (see below), whose sum is σ = 1039483920. Its totient is φ = 341935200.

The previous prime is 688429823. The next prime is 688429849. The reversal of 688429838 is 838924886.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1139483 + ... + 1140086.

It is an arithmetic number, because the mean of its divisors is an integer number (129935490).

Almost surely, 2^688429838 is an apocalyptic number.

688429838 is a deficient number, since it is larger than the sum of its proper divisors (351054082).

688429838 is a wasteful number, since it uses less digits than its factorization.

688429838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2279722.

The product of its digits is 5308416, while the sum is 56.

The square root of 688429838 is about 26237.9465278821. The cubic root of 688429838 is about 882.9848017984.

The spelling of 688429838 in words is "six hundred eighty-eight million, four hundred twenty-nine thousand, eight hundred thirty-eight".