128220966 has 24 divisors (see below), whose sum is σ = 279937944. Its totient is φ = 42413280.

The previous prime is 128220941. The next prime is 128220979. The reversal of 128220966 is 669022821.

It is a happy number.

It is a super-2 number, since 2×128220966² = 32881232243946312, which contains 22 as substring.

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 self number, because there is not a number n which added to its sum of digits gives 128220966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24831 + ... + 29546.

It is an arithmetic number, because the mean of its divisors is an integer number (11664081).

Almost surely, 2^128220966 is an apocalyptic number.

128220966 is an abundant number, since it is smaller than the sum of its proper divisors (151716978).

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

128220966 is a wasteful number, since it uses less digits than its factorization.

128220966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54516 (or 54513 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 128220966 is about 11323.4696979327. The cubic root of 128220966 is about 504.2582529454.

The spelling of 128220966 in words is "one hundred twenty-eight million, two hundred twenty thousand, nine hundred sixty-six".