128464789 has 2 divisors, whose sum is σ = 128464790. Its totient is φ = 128464788.

The previous prime is 128464769. The next prime is 128464799. The reversal of 128464789 is 987464821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71537764 + 56927025 = 8458^2 + 7545^2 .

It is a cyclic number.

It is not a de Polignac number, because 128464789 - 2¹⁵ = 128432021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128464709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64232394 + 64232395.

It is an arithmetic number, because the mean of its divisors is an integer number (64232395).

Almost surely, 2^128464789 is an apocalyptic number.

It is an amenable number.

128464789 is a deficient number, since it is larger than the sum of its proper divisors (1).

128464789 is an equidigital number, since it uses as much as digits as its factorization.

128464789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 774144, while the sum is 49.

The square root of 128464789 is about 11334.2308517164. The cubic root of 128464789 is about 504.5776804487.

The spelling of 128464789 in words is "one hundred twenty-eight million, four hundred sixty-four thousand, seven hundred eighty-nine".