128888447 has 2 divisors, whose sum is σ = 128888448. Its totient is φ = 128888446.

The previous prime is 128888393. The next prime is 128888453. The reversal of 128888447 is 744888821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128888447 - 2¹² = 128884351 is a prime.

It is a super-2 number, since 2×128888447² = 33224463540143618, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 128888395 and 128888404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128888477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64444223 + 64444224.

It is an arithmetic number, because the mean of its divisors is an integer number (64444224).

Almost surely, 2^128888447 is an apocalyptic number.

128888447 is a deficient number, since it is larger than the sum of its proper divisors (1).

128888447 is an equidigital number, since it uses as much as digits as its factorization.

128888447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 917504, while the sum is 50.

The square root of 128888447 is about 11352.9047824775. The cubic root of 128888447 is about 505.1317461710.

The spelling of 128888447 in words is "one hundred twenty-eight million, eight hundred eighty-eight thousand, four hundred forty-seven".