87886021 has 2 divisors, whose sum is σ = 87886022. Its totient is φ = 87886020.

The previous prime is 87885983. The next prime is 87886027. The reversal of 87886021 is 12068878.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68657796 + 19228225 = 8286^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 87886021 - 2¹¹ = 87883973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87886027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43943010 + 43943011.

It is an arithmetic number, because the mean of its divisors is an integer number (43943011).

Almost surely, 2^87886021 is an apocalyptic number.

It is an amenable number.

87886021 is a deficient number, since it is larger than the sum of its proper divisors (1).

87886021 is an equidigital number, since it uses as much as digits as its factorization.

87886021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 40.

The square root of 87886021 is about 9374.7544501176. The cubic root of 87886021 is about 444.6038995186.

The spelling of 87886021 in words is "eighty-seven million, eight hundred eighty-six thousand, twenty-one".