28057471 has 16 divisors (see below), whose sum is σ = 32911200. Its totient is φ = 23683968.

The previous prime is 28057459. The next prime is 28057481. The reversal of 28057471 is 17475082.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28057471 - 2⁵ = 28057439 is a prime.

It is a super-3 number, since 3×28057471³ (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 (28057411) 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 15 ways as a sum of consecutive naturals, for example, 5205 + ... + 9121.

It is an arithmetic number, because the mean of its divisors is an integer number (2056950).

Almost surely, 2^28057471 is an apocalyptic number.

28057471 is a deficient number, since it is larger than the sum of its proper divisors (4853729).

28057471 is a wasteful number, since it uses less digits than its factorization.

28057471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3978.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 28057471 is about 5296.9303374691. The cubic root of 28057471 is about 303.8665121171.

The spelling of 28057471 in words is "twenty-eight million, fifty-seven thousand, four hundred seventy-one".