28540757 has 8 divisors (see below), whose sum is σ = 32657856. Its totient is φ = 24433632.

The previous prime is 28540753. The next prime is 28540789. The reversal of 28540757 is 75704582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28540757 - 2² = 28540753 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28540757.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540751) 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 7 ways as a sum of consecutive naturals, for example, 5258 + ... + 9204.

It is an arithmetic number, because the mean of its divisors is an integer number (4082232).

Almost surely, 2^28540757 is an apocalyptic number.

It is an amenable number.

28540757 is a deficient number, since it is larger than the sum of its proper divisors (4117099).

28540757 is a wasteful number, since it uses less digits than its factorization.

28540757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4987.

The product of its (nonzero) digits is 78400, while the sum is 38.

The square root of 28540757 is about 5342.3550050516. The cubic root of 28540757 is about 305.6012755731.

The spelling of 28540757 in words is "twenty-eight million, five hundred forty thousand, seven hundred fifty-seven".