1687606613 has 16 divisors (see below), whose sum is σ = 2171904000. Its totient is φ = 1272596400.

The previous prime is 1687606579. The next prime is 1687606621. The reversal of 1687606613 is 3166067861.

It is a cyclic number.

It is not a de Polignac number, because 1687606613 - 2²⁰ = 1686558037 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1687606673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351113 + ... + 355886.

It is an arithmetic number, because the mean of its divisors is an integer number (135744000).

Almost surely, 2^1687606613 is an apocalyptic number.

It is an amenable number.

1687606613 is a deficient number, since it is larger than the sum of its proper divisors (484297387).

1687606613 is a wasteful number, since it uses less digits than its factorization.

1687606613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707048.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1687606613 is about 41080.4894445039. The cubic root of 1687606613 is about 1190.5758606835.

The spelling of 1687606613 in words is "one billion, six hundred eighty-seven million, six hundred six thousand, six hundred thirteen".