28540861 has 8 divisors (see below), whose sum is σ = 30227904. Its totient is φ = 26891040.

The previous prime is 28540849. The next prime is 28540921. The reversal of 28540861 is 16804582.

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 28540861 - 2⁹ = 28540349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7720 + ... + 10801.

It is an arithmetic number, because the mean of its divisors is an integer number (3778488).

Almost surely, 2^28540861 is an apocalyptic number.

It is an amenable number.

28540861 is a deficient number, since it is larger than the sum of its proper divisors (1687043).

28540861 is a wasteful number, since it uses less digits than its factorization.

28540861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18611.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 28540861 is about 5342.3647385779. The cubic root of 28540861 is about 305.6016467673.

The spelling of 28540861 in words is "twenty-eight million, five hundred forty thousand, eight hundred sixty-one".