1688139888 has 80 divisors (see below), whose sum is σ = 4489775136. Its totient is φ = 546324480.

The previous prime is 1688139877. The next prime is 1688139961. The reversal of 1688139888 is 8889318861.

1688139888 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243348 + ... + 250188.

Almost surely, 2^1688139888 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1688139888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2244887568).

1688139888 is an abundant number, since it is smaller than the sum of its proper divisors (2801635248).

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

1688139888 is a wasteful number, since it uses less digits than its factorization.

1688139888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7002 (or 6996 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 60.

The square root of 1688139888 is about 41086.9795434028. The cubic root of 1688139888 is about 1190.7012527572.

The spelling of 1688139888 in words is "one billion, six hundred eighty-eight million, one hundred thirty-nine thousand, eight hundred eighty-eight".