45728185 has 4 divisors (see below), whose sum is σ = 54873828. Its totient is φ = 36582544.

The previous prime is 45728171. The next prime is 45728191. The reversal of 45728185 is 58182754.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30173049 + 15555136 = 5493^2 + 3944^2 .

It is a cyclic number.

It is not a de Polignac number, because 45728185 - 2⁹ = 45727673 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4572814 + ... + 4572823.

It is an arithmetic number, because the mean of its divisors is an integer number (13718457).

Almost surely, 2^45728185 is an apocalyptic number.

It is an amenable number.

45728185 is a deficient number, since it is larger than the sum of its proper divisors (9145643).

45728185 is an equidigital number, since it uses as much as digits as its factorization.

45728185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9145642.

The product of its digits is 89600, while the sum is 40.

The square root of 45728185 is about 6762.2618257503. The cubic root of 45728185 is about 357.5976488434.

The spelling of 45728185 in words is "forty-five million, seven hundred twenty-eight thousand, one hundred eighty-five".