28445471 has 16 divisors (see below), whose sum is σ = 31049568. Its totient is φ = 25958400.

The previous prime is 28445467. The next prime is 28445479. The reversal of 28445471 is 17454482.

It is a cyclic number.

It is not a de Polignac number, because 28445471 - 2² = 28445467 is a prime.

It is a super-3 number, since 3×28445471³ (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 (28445479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117911 + ... + 118151.

It is an arithmetic number, because the mean of its divisors is an integer number (1940598).

Almost surely, 2^28445471 is an apocalyptic number.

28445471 is a deficient number, since it is larger than the sum of its proper divisors (2604097).

28445471 is a wasteful number, since it uses less digits than its factorization.

28445471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442.

The product of its digits is 35840, while the sum is 35.

The square root of 28445471 is about 5333.4295720484. The cubic root of 28445471 is about 305.2608035308.

The spelling of 28445471 in words is "twenty-eight million, four hundred forty-five thousand, four hundred seventy-one".