2001223528 has 16 divisors (see below), whose sum is σ = 3832130880. Its totient is φ = 979321968.

The previous prime is 2001223453. The next prime is 2001223529. The reversal of 2001223528 is 8253221002.

It is not an unprimeable number, because it can be changed into a prime (2001223529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2660826 + ... + 2661577.

It is an arithmetic number, because the mean of its divisors is an integer number (239508180).

Almost surely, 2^2001223528 is an apocalyptic number.

It is an amenable number.

2001223528 is a deficient number, since it is larger than the sum of its proper divisors (1830907352).

2001223528 is a wasteful number, since it uses less digits than its factorization.

2001223528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5322456 (or 5322452 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2001223528 is about 44735.0369173872. The cubic root of 2001223528 is about 1260.1779223006.

The spelling of 2001223528 in words is "two billion, one million, two hundred twenty-three thousand, five hundred twenty-eight".