688144042 has 8 divisors (see below), whose sum is σ = 1032475716. Its totient is φ = 343985472.

The previous prime is 688144021. The next prime is 688144057. The reversal of 688144042 is 240441886.

It can be written as a sum of positive squares in 2 ways, for example, as 443565721 + 244578321 = 21061^2 + 15639^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 688143992 and 688144010.

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, 32833 + ... + 49540.

Almost surely, 2^688144042 is an apocalyptic number.

688144042 is a deficient number, since it is larger than the sum of its proper divisors (344331674).

688144042 is a wasteful number, since it uses less digits than its factorization.

688144042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86552.

The product of its (nonzero) digits is 49152, while the sum is 37.

The square root of 688144042 is about 26232.4997283904. The cubic root of 688144042 is about 882.8625969203.

The spelling of 688144042 in words is "six hundred eighty-eight million, one hundred forty-four thousand, forty-two".