28144471 has 8 divisors (see below), whose sum is σ = 29527200. Its totient is φ = 26789280.

The previous prime is 28144463. The next prime is 28144477. The reversal of 28144471 is 17444182.

It is a happy number.

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 28144471 - 2³ = 28144463 is a prime.

It is a super-3 number, since 3×28144471³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28144477) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4776 + ... + 8893.

It is an arithmetic number, because the mean of its divisors is an integer number (3690900).

Almost surely, 2^28144471 is an apocalyptic number.

28144471 is a deficient number, since it is larger than the sum of its proper divisors (1382729).

28144471 is a wasteful number, since it uses less digits than its factorization.

28144471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13769.

The product of its digits is 7168, while the sum is 31.

The square root of 28144471 is about 5305.1362847716. The cubic root of 28144471 is about 304.1802622892.

The spelling of 28144471 in words is "twenty-eight million, one hundred forty-four thousand, four hundred seventy-one".