87378689 has 2 divisors, whose sum is σ = 87378690. Its totient is φ = 87378688.

The previous prime is 87378619. The next prime is 87378713. The reversal of 87378689 is 98687378.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86583025 + 795664 = 9305^2 + 892^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87378689 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87378619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43689344 + 43689345.

It is an arithmetic number, because the mean of its divisors is an integer number (43689345).

Almost surely, 2^87378689 is an apocalyptic number.

It is an amenable number.

87378689 is a deficient number, since it is larger than the sum of its proper divisors (1).

87378689 is an equidigital number, since it uses as much as digits as its factorization.

87378689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 56.

The square root of 87378689 is about 9347.6568721793. The cubic root of 87378689 is about 443.7467392738.

The spelling of 87378689 in words is "eighty-seven million, three hundred seventy-eight thousand, six hundred eighty-nine".