87388817 has 2 divisors, whose sum is σ = 87388818. Its totient is φ = 87388816.

The previous prime is 87388813. The next prime is 87388841. The reversal of 87388817 is 71888378.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80120401 + 7268416 = 8951^2 + 2696^2 .

It is a cyclic number.

It is not a de Polignac number, because 87388817 - 2² = 87388813 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (87388813) 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, 43694408 + 43694409.

It is an arithmetic number, because the mean of its divisors is an integer number (43694409).

Almost surely, 2^87388817 is an apocalyptic number.

It is an amenable number.

87388817 is a deficient number, since it is larger than the sum of its proper divisors (1).

87388817 is an equidigital number, since it uses as much as digits as its factorization.

87388817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 50.

The square root of 87388817 is about 9348.1985965212. The cubic root of 87388817 is about 443.7638833982.

The spelling of 87388817 in words is "eighty-seven million, three hundred eighty-eight thousand, eight hundred seventeen".