40728145 has 4 divisors (see below), whose sum is σ = 48873780. Its totient is φ = 32582512.

The previous prime is 40728143. The next prime is 40728169. The reversal of 40728145 is 54182704.

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 5870929 + 34857216 = 2423^2 + 5904^2 .

It is a cyclic number.

It is not a de Polignac number, because 40728145 - 2¹ = 40728143 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40728143) 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, 4072810 + ... + 4072819.

It is an arithmetic number, because the mean of its divisors is an integer number (12218445).

Almost surely, 2^40728145 is an apocalyptic number.

It is an amenable number.

40728145 is a deficient number, since it is larger than the sum of its proper divisors (8145635).

40728145 is an equidigital number, since it uses as much as digits as its factorization.

40728145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8145634.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 40728145 is about 6381.8606221070. The cubic root of 40728145 is about 344.0579072563.

It can be divided in two parts, 4072 and 8145, that multiplied together give a triangular number (33166440 = T₈₁₄₄).

The spelling of 40728145 in words is "forty million, seven hundred twenty-eight thousand, one hundred forty-five".