128657047 has 2 divisors, whose sum is σ = 128657048. Its totient is φ = 128657046.

The previous prime is 128656987. The next prime is 128657059. The reversal of 128657047 is 740756821.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 128657047 - 2⁷ = 128656919 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128657647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64328523 + 64328524.

It is an arithmetic number, because the mean of its divisors is an integer number (64328524).

Almost surely, 2^128657047 is an apocalyptic number.

128657047 is a deficient number, since it is larger than the sum of its proper divisors (1).

128657047 is an equidigital number, since it uses as much as digits as its factorization.

128657047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 128657047 is about 11342.7089797808. The cubic root of 128657047 is about 504.8292688221.

The spelling of 128657047 in words is "one hundred twenty-eight million, six hundred fifty-seven thousand, forty-seven".