987578857 has 2 divisors, whose sum is σ = 987578858. Its totient is φ = 987578856.

The previous prime is 987578843. The next prime is 987578869. The reversal of 987578857 is 758875789.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 888695721 + 98883136 = 29811^2 + 9944^2 .

It is a cyclic number.

It is not a de Polignac number, because 987578857 - 2¹⁵ = 987546089 is a prime.

It is not a weakly prime, because it can be changed into another prime (987578887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493789428 + 493789429.

It is an arithmetic number, because the mean of its divisors is an integer number (493789429).

Almost surely, 2^987578857 is an apocalyptic number.

It is an amenable number.

987578857 is a deficient number, since it is larger than the sum of its proper divisors (1).

987578857 is an equidigital number, since it uses as much as digits as its factorization.

987578857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 39513600, while the sum is 64.

The square root of 987578857 is about 31425.7674051088. The cubic root of 987578857 is about 995.8423569607.

The spelling of 987578857 in words is "nine hundred eighty-seven million, five hundred seventy-eight thousand, eight hundred fifty-seven".