87669 has 16 divisors (see below), whose sum is σ = 138240. Its totient is φ = 54720.

The previous prime is 87649. The next prime is 87671. The reversal of 87669 is 96678.

It is not a de Polignac number, because 87669 - 2⁷ = 87541 is a prime.

It is a super-2 number, since 2×87669² = 15371707122, which contains 22 as substring.

87669 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87629) 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, 364 + ... + 554.

It is an arithmetic number, because the mean of its divisors is an integer number (8640).

2⁸⁷⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

87669 is a deficient number, since it is larger than the sum of its proper divisors (50571).

87669 is a wasteful number, since it uses less digits than its factorization.

87669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217 (or 211 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 87669 is about 296.0895134921. The cubic root of 87669 is about 44.4237637581.

Subtracting 87669 from its reverse (96678), we obtain a palindrome (9009).

The spelling of 87669 in words is "eighty-seven thousand, six hundred sixty-nine".