128226708 has 18 divisors (see below), whose sum is σ = 324128714. Its totient is φ = 42742224.

The previous prime is 128226673. The next prime is 128226737. The reversal of 128226708 is 807622821.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 126967824 + 1258884 = 11268^2 + 1122^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 3561853 = 128226708 / (1 + 2 + 8 + 2 + 2 + 6 + 7 + 0 + 8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1780891 + ... + 1780962.

Almost surely, 2^128226708 is an apocalyptic number.

128226708 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

128226708 is an abundant number, since it is smaller than the sum of its proper divisors (195902006).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128226708 is a wasteful number, since it uses less digits than its factorization.

128226708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3561863 (or 3561858 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 128226708 is about 11323.7232392884. The cubic root of 128226708 is about 504.2657800755.

The spelling of 128226708 in words is "one hundred twenty-eight million, two hundred twenty-six thousand, seven hundred eight".