889778447 has 2 divisors, whose sum is σ = 889778448. Its totient is φ = 889778446.

The previous prime is 889778431. The next prime is 889778459. The reversal of 889778447 is 744877988.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 889778447 - 2⁴ = 889778431 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 889778447.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (889778497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 444889223 + 444889224.

It is an arithmetic number, because the mean of its divisors is an integer number (444889224).

Almost surely, 2^889778447 is an apocalyptic number.

889778447 is a deficient number, since it is larger than the sum of its proper divisors (1).

889778447 is an equidigital number, since it uses as much as digits as its factorization.

889778447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25288704, while the sum is 62.

The square root of 889778447 is about 29829.1543125178. The cubic root of 889778447 is about 961.8203478044.

The spelling of 889778447 in words is "eight hundred eighty-nine million, seven hundred seventy-eight thousand, four hundred forty-seven".