28909371 has 8 divisors (see below), whose sum is σ = 39366144. Its totient is φ = 18862760.

The previous prime is 28909369. The next prime is 28909379. The reversal of 28909371 is 17390982.

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 28909371 - 2¹ = 28909369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28909379) 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, 102375 + ... + 102656.

It is an arithmetic number, because the mean of its divisors is an integer number (4920768).

Almost surely, 2^28909371 is an apocalyptic number.

28909371 is a deficient number, since it is larger than the sum of its proper divisors (10456773).

28909371 is a wasteful number, since it uses less digits than its factorization.

28909371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205081.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 28909371 is about 5376.7435311720. The cubic root of 28909371 is about 306.9113014631.

The spelling of 28909371 in words is "twenty-eight million, nine hundred nine thousand, three hundred seventy-one".