28788471 has 6 divisors (see below), whose sum is σ = 41583360. Its totient is φ = 19192308.

The previous prime is 28788451. The next prime is 28788481. The reversal of 28788471 is 17488782.

It is not a de Polignac number, because 28788471 - 2⁶ = 28788407 is a prime.

It is a super-3 number, since 3×28788471³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788421) 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 5 ways as a sum of consecutive naturals, for example, 1599351 + ... + 1599368.

It is an arithmetic number, because the mean of its divisors is an integer number (6930560).

Almost surely, 2^28788471 is an apocalyptic number.

28788471 is a deficient number, since it is larger than the sum of its proper divisors (12794889).

28788471 is a wasteful number, since it uses less digits than its factorization.

28788471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3198725 (or 3198722 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 28788471 is about 5365.4888873242. The cubic root of 28788471 is about 306.4828657324.

The spelling of 28788471 in words is "twenty-eight million, seven hundred eighty-eight thousand, four hundred seventy-one".