220428444 has 12 divisors (see below), whose sum is σ = 514333064. Its totient is φ = 73476144.

The previous prime is 220428437. The next prime is 220428463. The reversal of 220428444 is 444824022.

220428444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×220428444² = 97177397848522272, which contains 22 as substring.

It is a congruent number.

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, 9184507 + ... + 9184530.

Almost surely, 2^220428444 is an apocalyptic number.

It is an amenable number.

220428444 is an abundant number, since it is smaller than the sum of its proper divisors (293904620).

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

220428444 is a wasteful number, since it uses less digits than its factorization.

220428444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18369044 (or 18369042 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 30.

The square root of 220428444 is about 14846.8327935624. The cubic root of 220428444 is about 604.0727037024.

The spelling of 220428444 in words is "two hundred twenty million, four hundred twenty-eight thousand, four hundred forty-four".