128220826 has 8 divisors (see below), whose sum is σ = 192776724. Its totient is φ = 63961920.

The previous prime is 128220823. The next prime is 128220839. The reversal of 128220826 is 628022821.

It can be written as a sum of positive squares in 2 ways, for example, as 109307025 + 18913801 = 10455^2 + 4349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (128220821) 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, 73165 + ... + 74896.

Almost surely, 2^128220826 is an apocalyptic number.

128220826 is a deficient number, since it is larger than the sum of its proper divisors (64555898).

128220826 is a wasteful number, since it uses less digits than its factorization.

128220826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148496.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 128220826 is about 11323.4635160802. The cubic root of 128220826 is about 504.2580694180.

The spelling of 128220826 in words is "one hundred twenty-eight million, two hundred twenty thousand, eight hundred twenty-six".