128860247 has 2 divisors, whose sum is σ = 128860248. Its totient is φ = 128860246.

The previous prime is 128860231. The next prime is 128860267. The reversal of 128860247 is 742068821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128860247 - 2⁴ = 128860231 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128860247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128860217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64430123 + 64430124.

It is an arithmetic number, because the mean of its divisors is an integer number (64430124).

Almost surely, 2^128860247 is an apocalyptic number.

128860247 is a deficient number, since it is larger than the sum of its proper divisors (1).

128860247 is an equidigital number, since it uses as much as digits as its factorization.

128860247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 128860247 is about 11351.6627416427. The cubic root of 128860247 is about 505.0949035768.

The spelling of 128860247 in words is "one hundred twenty-eight million, eight hundred sixty thousand, two hundred forty-seven".