688501042 has 8 divisors (see below), whose sum is σ = 1042977132. Its totient is φ = 340842000.

The previous prime is 688501001. The next prime is 688501057. The reversal of 688501042 is 240105886.

It can be written as a sum of positive squares in 2 ways, for example, as 673454401 + 15046641 = 25951^2 + 3879^2 .

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 = 688500989 and 688501007.

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, 1704009 + ... + 1704412.

Almost surely, 2^688501042 is an apocalyptic number.

688501042 is a deficient number, since it is larger than the sum of its proper divisors (354476090).

688501042 is a wasteful number, since it uses less digits than its factorization.

688501042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3408524.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 688501042 is about 26239.3033825214. The cubic root of 688501042 is about 883.0152429941.

The spelling of 688501042 in words is "six hundred eighty-eight million, five hundred one thousand, forty-two".