128120774 has 4 divisors (see below), whose sum is σ = 192181164. Its totient is φ = 64060386.

The previous prime is 128120749. The next prime is 128120807. The reversal of 128120774 is 477021821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128120774.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 32030192 + ... + 32030195.

It is an arithmetic number, because the mean of its divisors is an integer number (48045291).

Almost surely, 2^128120774 is an apocalyptic number.

128120774 is a deficient number, since it is larger than the sum of its proper divisors (64060390).

128120774 is an equidigital number, since it uses as much as digits as its factorization.

128120774 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64060389.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 128120774 is about 11319.0447476808. The cubic root of 128120774 is about 504.1268760741.

The spelling of 128120774 in words is "one hundred twenty-eight million, one hundred twenty thousand, seven hundred seventy-four".