1687982136 has 32 divisors (see below), whose sum is σ = 4322883600. Its totient is φ = 548936960.

The previous prime is 1687982123. The next prime is 1687982141. The reversal of 1687982136 is 6312897861.

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, 856731 + ... + 858698.

Almost surely, 2^1687982136 is an apocalyptic number.

It is an amenable number.

1687982136 is an abundant number, since it is smaller than the sum of its proper divisors (2634901464).

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

1687982136 is a wasteful number, since it uses less digits than its factorization.

1687982136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715479 (or 1715475 counting only the distinct ones).

The product of its digits is 870912, while the sum is 51.

The square root of 1687982136 is about 41085.0597662946. The cubic root of 1687982136 is about 1190.6641623564.

The spelling of 1687982136 in words is "one billion, six hundred eighty-seven million, nine hundred eighty-two thousand, one hundred thirty-six".