128779124 has 12 divisors (see below), whose sum is σ = 226667364. Its totient is φ = 64017024.

The previous prime is 128779121. The next prime is 128779127. The reversal of 128779124 is 421977821.

It is an interprime number because it is at equal distance from previous prime (128779121) and next prime (128779127).

It can be written as a sum of positive squares in 2 ways, for example, as 94439524 + 34339600 = 9718^2 + 5860^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128779121) 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, 92357 + ... + 93740.

It is an arithmetic number, because the mean of its divisors is an integer number (18888947).

Almost surely, 2^128779124 is an apocalyptic number.

It is an amenable number.

128779124 is a deficient number, since it is larger than the sum of its proper divisors (97888240).

128779124 is a wasteful number, since it uses less digits than its factorization.

128779124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186274 (or 186272 counting only the distinct ones).

The product of its digits is 56448, while the sum is 41.

The square root of 128779124 is about 11348.0890021184. The cubic root of 128779124 is about 504.9888884266.

The spelling of 128779124 in words is "one hundred twenty-eight million, seven hundred seventy-nine thousand, one hundred twenty-four".