52728181 has 4 divisors (see below), whose sum is σ = 57521664. Its totient is φ = 47934700.

The previous prime is 52728131. The next prime is 52728187. The reversal of 52728181 is 18182725.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 52728181 - 2⁹ = 52727669 is a prime.

It is a super-2 number, since 2×52728181² = 5560522143137522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52728187) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2396725 + ... + 2396746.

It is an arithmetic number, because the mean of its divisors is an integer number (14380416).

Almost surely, 2^52728181 is an apocalyptic number.

It is an amenable number.

52728181 is a deficient number, since it is larger than the sum of its proper divisors (4793483).

52728181 is a wasteful number, since it uses less digits than its factorization.

52728181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4793482.

The product of its digits is 8960, while the sum is 34.

The square root of 52728181 is about 7261.4172859023. The cubic root of 52728181 is about 374.9853173511.

The spelling of 52728181 in words is "fifty-two million, seven hundred twenty-eight thousand, one hundred eighty-one".