128128826 has 12 divisors (see below), whose sum is σ = 223571898. Its totient is φ = 54912312.

The previous prime is 128128811. The next prime is 128128831. The reversal of 128128826 is 628821821.

It can be written as a sum of positive squares in only one way, i.e., 120012025 + 8116801 = 10955^2 + 2849^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128128826.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 653621 + ... + 653816.

Almost surely, 2^128128826 is an apocalyptic number.

128128826 is a deficient number, since it is larger than the sum of its proper divisors (95443072).

128128826 is a wasteful number, since it uses less digits than its factorization.

128128826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1307453 (or 1307446 counting only the distinct ones).

The product of its digits is 24576, while the sum is 38.

The square root of 128128826 is about 11319.4004258176. The cubic root of 128128826 is about 504.1374367985.

The spelling of 128128826 in words is "one hundred twenty-eight million, one hundred twenty-eight thousand, eight hundred twenty-six".