128838577 has 4 divisors (see below), whose sum is σ = 147244096. Its totient is φ = 110433060.

The previous prime is 128838559. The next prime is 128838581. The reversal of 128838577 is 775838821.

It is a happy number.

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 128838577 - 2¹⁹ = 128314289 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128838577.

It is not an unprimeable number, because it can be changed into a prime (128838557) 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, 9202749 + ... + 9202762.

It is an arithmetic number, because the mean of its divisors is an integer number (36811024).

Almost surely, 2^128838577 is an apocalyptic number.

It is an amenable number.

128838577 is a deficient number, since it is larger than the sum of its proper divisors (18405519).

128838577 is an equidigital number, since it uses as much as digits as its factorization.

128838577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18405518.

The product of its digits is 752640, while the sum is 49.

The square root of 128838577 is about 11350.7082157899. The cubic root of 128838577 is about 505.0665886117.

The spelling of 128838577 in words is "one hundred twenty-eight million, eight hundred thirty-eight thousand, five hundred seventy-seven".