128042977 has 8 divisors (see below), whose sum is σ = 131690216. Its totient is φ = 124405632.

The previous prime is 128042969. The next prime is 128042987. The reversal of 128042977 is 779240821.

It can be written as a sum of positive squares in 4 ways, for example, as 15492096 + 112550881 = 3936^2 + 10609^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128042977 - 2³ = 128042969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128042987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29533 + ... + 33589.

It is an arithmetic number, because the mean of its divisors is an integer number (16461277).

Almost surely, 2^128042977 is an apocalyptic number.

It is an amenable number.

128042977 is a deficient number, since it is larger than the sum of its proper divisors (3647239).

128042977 is an equidigital number, since it uses as much as digits as its factorization.

128042977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4947.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 128042977 is about 11315.6076725910. The cubic root of 128042977 is about 504.0248174245.

The spelling of 128042977 in words is "one hundred twenty-eight million, forty-two thousand, nine hundred seventy-seven".