128752977 has 4 divisors (see below), whose sum is σ = 171670640. Its totient is φ = 85835316.

The previous prime is 128752973. The next prime is 128752999. The reversal of 128752977 is 779257821.

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 not a de Polignac number, because 128752977 - 2² = 128752973 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128752973) 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, 21458827 + ... + 21458832.

It is an arithmetic number, because the mean of its divisors is an integer number (42917660).

Almost surely, 2^128752977 is an apocalyptic number.

It is an amenable number.

128752977 is a deficient number, since it is larger than the sum of its proper divisors (42917663).

128752977 is an equidigital number, since it uses as much as digits as its factorization.

128752977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42917662.

The product of its digits is 493920, while the sum is 48.

The square root of 128752977 is about 11346.9368994456. The cubic root of 128752977 is about 504.9547088748.

The spelling of 128752977 in words is "one hundred twenty-eight million, seven hundred fifty-two thousand, nine hundred seventy-seven".