28991341 has 8 divisors (see below), whose sum is σ = 31086720. Its totient is φ = 26939328.

The previous prime is 28991327. The next prime is 28991351. The reversal of 28991341 is 14319982.

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 28991341 - 2¹¹ = 28989293 is a prime.

It is a super-4 number, since 4×28991341⁴ (a number of 31 digits) contains 4444 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 28991341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28991311) 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 7 ways as a sum of consecutive naturals, for example, 9451 + ... + 12136.

It is an arithmetic number, because the mean of its divisors is an integer number (3885840).

Almost surely, 2^28991341 is an apocalyptic number.

It is an amenable number.

28991341 is a deficient number, since it is larger than the sum of its proper divisors (2095379).

28991341 is a wasteful number, since it uses less digits than its factorization.

28991341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21683.

The product of its digits is 15552, while the sum is 37.

The square root of 28991341 is about 5384.3607791455. The cubic root of 28991341 is about 307.2011011437.

The spelling of 28991341 in words is "twenty-eight million, nine hundred ninety-one thousand, three hundred forty-one".