40728501 has 32 divisors (see below), whose sum is σ = 66675840. Its totient is φ = 24669360.

The previous prime is 40728491. The next prime is 40728503. The reversal of 40728501 is 10582704.

It is not a de Polignac number, because 40728501 - 2⁶ = 40728437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40728503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23211 + ... + 24903.

It is an arithmetic number, because the mean of its divisors is an integer number (2083620).

Almost surely, 2^40728501 is an apocalyptic number.

It is an amenable number.

40728501 is a deficient number, since it is larger than the sum of its proper divisors (25947339).

40728501 is an equidigital number, since it uses as much as digits as its factorization.

40728501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1707 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 27.

The square root of 40728501 is about 6381.8885135985. Note that the first 3 decimals coincide. The cubic root of 40728501 is about 344.0589097102.

The spelling of 40728501 in words is "forty million, seven hundred twenty-eight thousand, five hundred one".