28940471 has 8 divisors (see below), whose sum is σ = 33194784. Its totient is φ = 24716160.

The previous prime is 28940459. The next prime is 28940479. The reversal of 28940471 is 17404982.

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

It is not a de Polignac number, because 28940471 - 2²² = 24746167 is a prime.

It is a super-3 number, since 3×28940471³ (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 (28940479) 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, 5390 + ... + 9323.

It is an arithmetic number, because the mean of its divisors is an integer number (4149348).

Almost surely, 2^28940471 is an apocalyptic number.

28940471 is a deficient number, since it is larger than the sum of its proper divisors (4254313).

28940471 is a wasteful number, since it uses less digits than its factorization.

28940471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15001.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 28940471 is about 5379.6348389087. The cubic root of 28940471 is about 307.0213179324.

The spelling of 28940471 in words is "twenty-eight million, nine hundred forty thousand, four hundred seventy-one".