28807471 has 8 divisors (see below), whose sum is σ = 35915904. Its totient is φ = 22447320.

The previous prime is 28807447. The next prime is 28807481. The reversal of 28807471 is 17470882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28807471 - 2⁷ = 28807343 is a prime.

It is a super-3 number, since 3×28807471³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28807471.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28807481) 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, 186985 + ... + 187138.

It is an arithmetic number, because the mean of its divisors is an integer number (4489488).

Almost surely, 2^28807471 is an apocalyptic number.

28807471 is a deficient number, since it is larger than the sum of its proper divisors (7108433).

28807471 is a wasteful number, since it uses less digits than its factorization.

28807471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374141.

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 28807471 is about 5367.2591701911. The cubic root of 28807471 is about 306.5502757481.

The spelling of 28807471 in words is "twenty-eight million, eight hundred seven thousand, four hundred seventy-one".