87666443 has 2 divisors, whose sum is σ = 87666444. Its totient is φ = 87666442.

The previous prime is 87666413. The next prime is 87666451. The reversal of 87666443 is 34466678.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87666443 - 2¹⁰ = 87665419 is a prime.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 87666394 and 87666403.

It is not a weakly prime, because it can be changed into another prime (87666413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43833221 + 43833222.

It is an arithmetic number, because the mean of its divisors is an integer number (43833222).

Almost surely, 2^87666443 is an apocalyptic number.

87666443 is a deficient number, since it is larger than the sum of its proper divisors (1).

87666443 is an equidigital number, since it uses as much as digits as its factorization.

87666443 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 44.

The square root of 87666443 is about 9363.0359926682. The cubic root of 87666443 is about 444.2333185829.

The spelling of 87666443 in words is "eighty-seven million, six hundred sixty-six thousand, four hundred forty-three".