1686687016 has 24 divisors (see below), whose sum is σ = 3678871770. Its totient is φ = 722865696.

The previous prime is 1686686993. The next prime is 1686687031. The reversal of 1686687016 is 6107866861.

It can be written as a sum of positive squares in only one way, i.e., 1444760100 + 241926916 = 38010^2 + 15554^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2150995 + ... + 2151778.

Almost surely, 2^1686687016 is an apocalyptic number.

It is an amenable number.

1686687016 is an abundant number, since it is smaller than the sum of its proper divisors (1992184754).

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

1686687016 is a wasteful number, since it uses less digits than its factorization.

1686687016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4302793 (or 4302782 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 1686687016 is about 41069.2952946602. The cubic root of 1686687016 is about 1190.3595683898.

The spelling of 1686687016 in words is "one billion, six hundred eighty-six million, six hundred eighty-seven thousand, sixteen".