87869 has 2 divisors, whose sum is σ = 87870. Its totient is φ = 87868.

The previous prime is 87853. The next prime is 87877. The reversal of 87869 is 96878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 52900 + 34969 = 230^2 + 187^2 .

It is a cyclic number.

It is not a de Polignac number, because 87869 - 2⁴ = 87853 is a prime.

It is a super-2 number, since 2×87869² = 15441922322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43934 + 43935.

It is an arithmetic number, because the mean of its divisors is an integer number (43935).

2⁸⁷⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

87869 is a deficient number, since it is larger than the sum of its proper divisors (1).

87869 is an equidigital number, since it uses as much as digits as its factorization.

87869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 38.

The square root of 87869 is about 296.4270567948. The cubic root of 87869 is about 44.4575195327.

Subtracting 87869 from its reverse (96878), we obtain a palindrome (9009).

The spelling of 87869 in words is "eighty-seven thousand, eight hundred sixty-nine".