87688109 has 2 divisors, whose sum is σ = 87688110. Its totient is φ = 87688108.

The previous prime is 87688087. The next prime is 87688127. The reversal of 87688109 is 90188678.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 84695209 + 2992900 = 9203^2 + 1730^2 .

It is a cyclic number.

It is not a de Polignac number, because 87688109 - 2¹² = 87684013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87688009) 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, 43844054 + 43844055.

It is an arithmetic number, because the mean of its divisors is an integer number (43844055).

Almost surely, 2^87688109 is an apocalyptic number.

It is an amenable number.

87688109 is a deficient number, since it is larger than the sum of its proper divisors (1).

87688109 is an equidigital number, since it uses as much as digits as its factorization.

87688109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 87688109 is about 9364.1929177052. The cubic root of 87688109 is about 444.2699117040.

The spelling of 87688109 in words is "eighty-seven million, six hundred eighty-eight thousand, one hundred nine".