77889289 has 2 divisors, whose sum is σ = 77889290. Its totient is φ = 77889288.

The previous prime is 77889283. The next prime is 77889311. The reversal of 77889289 is 98298877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75690000 + 2199289 = 8700^2 + 1483^2 .

It is a cyclic number.

It is not a de Polignac number, because 77889289 - 2²³ = 69500681 is a prime.

It is not a weakly prime, because it can be changed into another prime (77889283) 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, 38944644 + 38944645.

It is an arithmetic number, because the mean of its divisors is an integer number (38944645).

Almost surely, 2^77889289 is an apocalyptic number.

It is an amenable number.

77889289 is a deficient number, since it is larger than the sum of its proper divisors (1).

77889289 is an equidigital number, since it uses as much as digits as its factorization.

77889289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4064256, while the sum is 58.

The square root of 77889289 is about 8825.4908645355. The cubic root of 77889289 is about 427.0636227450.

The spelling of 77889289 in words is "seventy-seven million, eight hundred eighty-nine thousand, two hundred eighty-nine".