87220871 has 2 divisors, whose sum is σ = 87220872. Its totient is φ = 87220870.

The previous prime is 87220843. The next prime is 87220907. The reversal of 87220871 is 17802278.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87220871 - 2¹⁴ = 87204487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87220831) 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 as a sum of consecutive naturals, namely, 43610435 + 43610436.

It is an arithmetic number, because the mean of its divisors is an integer number (43610436).

Almost surely, 2^87220871 is an apocalyptic number.

87220871 is a deficient number, since it is larger than the sum of its proper divisors (1).

87220871 is an equidigital number, since it uses as much as digits as its factorization.

87220871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 87220871 is about 9339.2114763507. The cubic root of 87220871 is about 443.4794222728.

The spelling of 87220871 in words is "eighty-seven million, two hundred twenty thousand, eight hundred seventy-one".