1687888764 has 108 divisors (see below), whose sum is σ = 4490421936. Its totient is φ = 534530304.

The previous prime is 1687888759. The next prime is 1687888817. The reversal of 1687888764 is 4678887861.

1687888764 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 35 ways as a sum of consecutive naturals, for example, 5008404 + ... + 5008740.

Almost surely, 2^1687888764 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 1687888764, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2245210968).

1687888764 is an abundant number, since it is smaller than the sum of its proper divisors (2802533172).

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

1687888764 is a wasteful number, since it uses less digits than its factorization.

1687888764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 656 (or 628 counting only the distinct ones).

The product of its digits is 28901376, while the sum is 63.

The square root of 1687888764 is about 41083.9234251063. The cubic root of 1687888764 is about 1190.6422077906.

The spelling of 1687888764 in words is "one billion, six hundred eighty-seven million, eight hundred eighty-eight thousand, seven hundred sixty-four".