688328646 has 16 divisors (see below), whose sum is σ = 1389524544. Its totient is φ = 227298344.

The previous prime is 688328621. The next prime is 688328651. The reversal of 688328646 is 646823886.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 535440 + ... + 536723.

It is an arithmetic number, because the mean of its divisors is an integer number (86845284).

Almost surely, 2^688328646 is an apocalyptic number.

688328646 is an abundant number, since it is smaller than the sum of its proper divisors (701195898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

688328646 is a wasteful number, since it uses less digits than its factorization.

688328646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1072275.

The product of its digits is 2654208, while the sum is 51.

The square root of 688328646 is about 26236.0181048878. The cubic root of 688328646 is about 882.9415364955.

The spelling of 688328646 in words is "six hundred eighty-eight million, three hundred twenty-eight thousand, six hundred forty-six".