128440826 has 16 divisors (see below), whose sum is σ = 199864800. Its totient is φ = 61831728.

The previous prime is 128440813. The next prime is 128440847. The reversal of 128440826 is 628044821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19061 + ... + 24903.

It is an arithmetic number, because the mean of its divisors is an integer number (12491550).

Almost surely, 2^128440826 is an apocalyptic number.

128440826 is a deficient number, since it is larger than the sum of its proper divisors (71423974).

128440826 is a wasteful number, since it uses less digits than its factorization.

128440826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6253.

The product of its (nonzero) digits is 24576, while the sum is 35.

The square root of 128440826 is about 11333.1736949541. The cubic root of 128440826 is about 504.5463049335.

The spelling of 128440826 in words is "one hundred twenty-eight million, four hundred forty thousand, eight hundred twenty-six".