1688048728 has 32 divisors (see below), whose sum is σ = 3414519360. Its totient is φ = 779384320.

The previous prime is 1688048717. The next prime is 1688048759. The reversal of 1688048728 is 8278408861.

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, 109888 + ... + 124303.

It is an arithmetic number, because the mean of its divisors is an integer number (106703730).

Almost surely, 2^1688048728 is an apocalyptic number.

It is an amenable number.

1688048728 is an abundant number, since it is smaller than the sum of its proper divisors (1726470632).

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

1688048728 is a wasteful number, since it uses less digits than its factorization.

1688048728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234267 (or 234263 counting only the distinct ones).

The product of its (nonzero) digits is 1376256, while the sum is 52.

The square root of 1688048728 is about 41085.8701745503. The cubic root of 1688048728 is about 1190.6798196439.

The spelling of 1688048728 in words is "one billion, six hundred eighty-eight million, forty-eight thousand, seven hundred twenty-eight".