128368077 has 4 divisors (see below), whose sum is σ = 171157440. Its totient is φ = 85578716.

The previous prime is 128368073. The next prime is 128368087. The reversal of 128368077 is 770863821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128368077 - 2² = 128368073 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128368073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21394677 + ... + 21394682.

It is an arithmetic number, because the mean of its divisors is an integer number (42789360).

Almost surely, 2^128368077 is an apocalyptic number.

It is an amenable number.

128368077 is a deficient number, since it is larger than the sum of its proper divisors (42789363).

128368077 is an equidigital number, since it uses as much as digits as its factorization.

128368077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42789362.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 128368077 is about 11329.9636804360. The cubic root of 128368077 is about 504.4510284485.

The spelling of 128368077 in words is "one hundred twenty-eight million, three hundred sixty-eight thousand, seventy-seven".