128978207 has 2 divisors, whose sum is σ = 128978208. Its totient is φ = 128978206.

The previous prime is 128978173. The next prime is 128978257. The reversal of 128978207 is 702879821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128978207 - 2¹⁴ = 128961823 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 (128978257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64489103 + 64489104.

It is an arithmetic number, because the mean of its divisors is an integer number (64489104).

Almost surely, 2^128978207 is an apocalyptic number.

128978207 is a deficient number, since it is larger than the sum of its proper divisors (1).

128978207 is an equidigital number, since it uses as much as digits as its factorization.

128978207 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 44.

The square root of 128978207 is about 11356.8572677480. The cubic root of 128978207 is about 505.2489796013.

The spelling of 128978207 in words is "one hundred twenty-eight million, nine hundred seventy-eight thousand, two hundred seven".