28540471 has 4 divisors (see below), whose sum is σ = 28591200. Its totient is φ = 28489744.

The previous prime is 28540441. The next prime is 28540507. The reversal of 28540471 is 17404582.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28540471 is a prime.

It is a super-3 number, since 3×28540471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540411) 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 3 ways as a sum of consecutive naturals, for example, 24511 + ... + 25648.

It is an arithmetic number, because the mean of its divisors is an integer number (7147800).

Almost surely, 2^28540471 is an apocalyptic number.

28540471 is a deficient number, since it is larger than the sum of its proper divisors (50729).

28540471 is an equidigital number, since it uses as much as digits as its factorization.

28540471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50728.

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

The square root of 28540471 is about 5342.3282377630. The cubic root of 28540471 is about 305.6002547842.

The spelling of 28540471 in words is "twenty-eight million, five hundred forty thousand, four hundred seventy-one".