128261367 has 24 divisors (see below), whose sum is σ = 205765200. Its totient is φ = 78927264.

The previous prime is 128261359. The next prime is 128261369. The reversal of 128261367 is 763162821.

It is not a de Polignac number, because 128261367 - 2³ = 128261359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128261369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9492 + ... + 18617.

It is an arithmetic number, because the mean of its divisors is an integer number (8573550).

Almost surely, 2^128261367 is an apocalyptic number.

128261367 is a deficient number, since it is larger than the sum of its proper divisors (77503833).

128261367 is a wasteful number, since it uses less digits than its factorization.

128261367 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28144 (or 28125 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 128261367 is about 11325.2535070964. The cubic root of 128261367 is about 504.3112094391.

The spelling of 128261367 in words is "one hundred twenty-eight million, two hundred sixty-one thousand, three hundred sixty-seven".