43225728 has 128 divisors (see below), whose sum is σ = 141429120. Its totient is φ = 11390976.

The previous prime is 43225727. The next prime is 43225729. The reversal of 43225728 is 82752234.

It is an interprime number because it is at equal distance from previous prime (43225727) and next prime (43225729).

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×43225728² = 3736927122259968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43225727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34326 + ... + 35562.

It is an arithmetic number, because the mean of its divisors is an integer number (1104915).

Almost surely, 2^43225728 is an apocalyptic number.

43225728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 43225728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70714560).

43225728 is an abundant number, since it is smaller than the sum of its proper divisors (98203392).

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

43225728 is a wasteful number, since it uses less digits than its factorization.

43225728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1274 (or 1262 counting only the distinct ones).

The product of its digits is 26880, while the sum is 33.

The square root of 43225728 is about 6574.6275940163. The cubic root of 43225728 is about 350.9517713623.

The spelling of 43225728 in words is "forty-three million, two hundred twenty-five thousand, seven hundred twenty-eight".