28343381 has 8 divisors (see below), whose sum is σ = 30959904. Its totient is φ = 25733520.

The previous prime is 28343339. The next prime is 28343387. The reversal of 28343381 is 18334382.

It is a happy number.

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 28343381 - 2¹⁸ = 28081237 is a prime.

It is a super-2 number, since 2×28343381² = 1606694493022322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28343387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12566 + ... + 14648.

It is an arithmetic number, because the mean of its divisors is an integer number (3869988).

Almost surely, 2^28343381 is an apocalyptic number.

It is an amenable number.

28343381 is a deficient number, since it is larger than the sum of its proper divisors (2616523).

28343381 is a wasteful number, since it uses less digits than its factorization.

28343381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3331.

The product of its digits is 13824, while the sum is 32.

The square root of 28343381 is about 5323.8502045043. The cubic root of 28343381 is about 304.8951749417.

The spelling of 28343381 in words is "twenty-eight million, three hundred forty-three thousand, three hundred eighty-one".