236821728 has 144 divisors (see below), whose sum is σ = 734904576. Its totient is φ = 66193920.

The previous prime is 236821727. The next prime is 236821787. The reversal of 236821728 is 827128632.

236821728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (236821721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177801 + ... + 179127.

It is an arithmetic number, because the mean of its divisors is an integer number (5103504).

Almost surely, 2^236821728 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 236821728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (367452288).

236821728 is an abundant number, since it is smaller than the sum of its proper divisors (498082848).

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

236821728 is a wasteful number, since it uses less digits than its factorization.

236821728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1377 (or 1356 counting only the distinct ones).

The product of its digits is 64512, while the sum is 39.

The square root of 236821728 is about 15389.0132237256. The cubic root of 236821728 is about 618.6910713801.

The spelling of 236821728 in words is "two hundred thirty-six million, eight hundred twenty-one thousand, seven hundred twenty-eight".