128504377 has 4 divisors (see below), whose sum is σ = 136063476. Its totient is φ = 120945280.

The previous prime is 128504371. The next prime is 128504399. The reversal of 128504377 is 773405821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 773405821 = 47 ⋅16455443.

It can be written as a sum of positive squares in 2 ways, for example, as 58430736 + 70073641 = 7644^2 + 8371^2 .

It is a cyclic number.

It is not a de Polignac number, because 128504377 - 2²³ = 120115769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128504371) 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, 3779524 + ... + 3779557.

It is an arithmetic number, because the mean of its divisors is an integer number (34015869).

Almost surely, 2^128504377 is an apocalyptic number.

128504377 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

128504377 is a deficient number, since it is larger than the sum of its proper divisors (7559099).

128504377 is an equidigital number, since it uses as much as digits as its factorization.

128504377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7559098.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 128504377 is about 11335.9771083043. The cubic root of 128504377 is about 504.6295057254.

It can be divided in two parts, 128504 and 377, that added together give a square (128881 = 359²).

The spelling of 128504377 in words is "one hundred twenty-eight million, five hundred four thousand, three hundred seventy-seven".