157687 has 4 divisors (see below), whose sum is σ = 158976. Its totient is φ = 156400.

The previous prime is 157679. The next prime is 157721. The reversal of 157687 is 786751.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 157687 - 2³ = 157679 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 439 + ... + 712.

It is an arithmetic number, because the mean of its divisors is an integer number (39744).

2¹⁵⁷⁶⁸⁷ is an apocalyptic number.

157687 is a deficient number, since it is larger than the sum of its proper divisors (1289).

157687 is a wasteful number, since it uses less digits than its factorization.

157687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1288.

The product of its digits is 11760, while the sum is 34.

The square root of 157687 is about 397.0982246246. The cubic root of 157687 is about 54.0254795167.

The spelling of 157687 in words is "one hundred fifty-seven thousand, six hundred eighty-seven".