128013679 has 2 divisors, whose sum is σ = 128013680. Its totient is φ = 128013678.

The previous prime is 128013667. The next prime is 128013701. The reversal of 128013679 is 976310821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128013679 - 2⁵ = 128013647 is a prime.

It is a super-2 number, since 2×128013679² = 32775004022230082, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (128013779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64006839 + 64006840.

It is an arithmetic number, because the mean of its divisors is an integer number (64006840).

Almost surely, 2^128013679 is an apocalyptic number.

128013679 is a deficient number, since it is larger than the sum of its proper divisors (1).

128013679 is an equidigital number, since it uses as much as digits as its factorization.

128013679 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 128013679 is about 11314.3130149382. The cubic root of 128013679 is about 503.9863718810.

The spelling of 128013679 in words is "one hundred twenty-eight million, thirteen thousand, six hundred seventy-nine".