28819471 has 8 divisors (see below), whose sum is σ = 30562704. Its totient is φ = 27081600.

The previous prime is 28819459. The next prime is 28819477. The reversal of 28819471 is 17491882.

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 a de Polignac number, because none of the positive numbers 2^k-28819471 is a prime.

It is a super-3 number, since 3×28819471³ (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 (28819477) 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 7 ways as a sum of consecutive naturals, for example, 17061 + ... + 18673.

It is an arithmetic number, because the mean of its divisors is an integer number (3820338).

Almost surely, 2^28819471 is an apocalyptic number.

28819471 is a deficient number, since it is larger than the sum of its proper divisors (1743233).

28819471 is a wasteful number, since it uses less digits than its factorization.

28819471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2681.

The product of its digits is 32256, while the sum is 40.

The square root of 28819471 is about 5368.3769428012. The cubic root of 28819471 is about 306.5928352245.

The spelling of 28819471 in words is "twenty-eight million, eight hundred nineteen thousand, four hundred seventy-one".