1687715436 has 144 divisors (see below), whose sum is σ = 4649718528. Its totient is φ = 471609600.

The previous prime is 1687715429. The next prime is 1687715437. The reversal of 1687715436 is 6345177861.

It is not an unprimeable number, because it can be changed into a prime (1687715437) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2552946 + ... + 2553606.

It is an arithmetic number, because the mean of its divisors is an integer number (32289712).

Almost surely, 2^1687715436 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 1687715436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2324859264).

1687715436 is an abundant number, since it is smaller than the sum of its proper divisors (2962003092).

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

1687715436 is a wasteful number, since it uses less digits than its factorization.

1687715436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760 (or 729 counting only the distinct ones).

The product of its digits is 846720, while the sum is 48.

The square root of 1687715436 is about 41081.8139326880. The cubic root of 1687715436 is about 1190.6014510178.

The spelling of 1687715436 in words is "one billion, six hundred eighty-seven million, seven hundred fifteen thousand, four hundred thirty-six".