128684623 has 2 divisors, whose sum is σ = 128684624. Its totient is φ = 128684622.

The previous prime is 128684617. The next prime is 128684641. The reversal of 128684623 is 326486821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128684623 - 2⁹ = 128684111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128684693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64342311 + 64342312.

It is an arithmetic number, because the mean of its divisors is an integer number (64342312).

Almost surely, 2^128684623 is an apocalyptic number.

128684623 is a deficient number, since it is larger than the sum of its proper divisors (1).

128684623 is an equidigital number, since it uses as much as digits as its factorization.

128684623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 110592, while the sum is 40.

The square root of 128684623 is about 11343.9244972805. The cubic root of 128684623 is about 504.8653341543.

The spelling of 128684623 in words is "one hundred twenty-eight million, six hundred eighty-four thousand, six hundred twenty-three".