4193728081 has 9 divisors (see below), whose sum is σ = 4335448923. Its totient is φ = 4056503760.

The previous prime is 4193728043. The next prime is 4193728109. The reversal of 4193728081 is 1808273914.

The square root of 4193728081 is 64759.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 3695545681 + 498182400 = 60791^2 + 22320^2 .

It is not a de Polignac number, because 4193728081 - 2⁷ = 4193727953 is a prime.

It is a super-2 number, since 2×4193728081² = 35174710434735885122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4193768081) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2006485 + ... + 2008573.

It is an arithmetic number, because the mean of its divisors is an integer number (481716547).

Almost surely, 2^4193728081 is an apocalyptic number.

4193728081 is the 64759-th square number.

4193728081 is the 32380-th centered octagonal number.

It is an amenable number.

4193728081 is a deficient number, since it is larger than the sum of its proper divisors (141720842).

4193728081 is an frugal number, since it uses more digits than its factorization.

4193728081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240 (or 2120 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 43.

The cubic root of 4193728081 is about 1612.6251273692.

The spelling of 4193728081 in words is "four billion, one hundred ninety-three million, seven hundred twenty-eight thousand, eighty-one".