211233728 has 42 divisors (see below), whose sum is σ = 426631608. Its totient is φ = 103768320.

The previous prime is 211233727. The next prime is 211233769. The reversal of 211233728 is 827332112.

It is a self number, because there is not a number n which added to its sum of digits gives 211233728.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211233727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 237701 + ... + 238587.

Almost surely, 2^211233728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211233728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (213315804).

211233728 is an abundant number, since it is smaller than the sum of its proper divisors (215397880).

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

211233728 is an frugal number, since it uses more digits than its factorization.

211233728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021 (or 950 counting only the distinct ones).

The product of its digits is 4032, while the sum is 29.

The square root of 211233728 is about 14533.8820691514. The cubic root of 211233728 is about 595.5539205255.

The spelling of 211233728 in words is "two hundred eleven million, two hundred thirty-three thousand, seven hundred twenty-eight".