688486642 has 8 divisors (see below), whose sum is σ = 1052215596. Its totient is φ = 337748112.

The previous prime is 688486571. The next prime is 688486661. The reversal of 688486642 is 246684886.

It can be written as a sum of positive squares in 2 ways, for example, as 688485121 + 1521 = 26239^2 + 39^2 .

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 688486642.

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, 3247473 + ... + 3247684.

Almost surely, 2^688486642 is an apocalyptic number.

688486642 is a deficient number, since it is larger than the sum of its proper divisors (363728954).

688486642 is a wasteful number, since it uses less digits than its factorization.

688486642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6495212.

The product of its digits is 3538944, while the sum is 52.

The square root of 688486642 is about 26239.0289835581. The cubic root of 688486642 is about 883.0090868630.

The spelling of 688486642 in words is "six hundred eighty-eight million, four hundred eighty-six thousand, six hundred forty-two".