128305772 has 12 divisors (see below), whose sum is σ = 256611600. Its totient is φ = 54988176.

The previous prime is 128305747. The next prime is 128305781. The reversal of 128305772 is 277503821.

128305772 is an admirable number.

It is a super-2 number, since 2×128305772² = 32924742257031968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2291147 + ... + 2291202.

It is an arithmetic number, because the mean of its divisors is an integer number (21384300).

Almost surely, 2^128305772 is an apocalyptic number.

It is an amenable number.

128305772 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128305772 is a wasteful number, since it uses less digits than its factorization.

128305772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4582360 (or 4582358 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 35.

The square root of 128305772 is about 11327.2137792133. The cubic root of 128305772 is about 504.3694014366.

The spelling of 128305772 in words is "one hundred twenty-eight million, three hundred five thousand, seven hundred seventy-two".