28861393 has 8 divisors (see below), whose sum is σ = 33337440. Its totient is φ = 24694080.

The previous prime is 28861381. The next prime is 28861439. The reversal of 28861393 is 39316882.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28861393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28861303) 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, 76983 + ... + 77356.

It is an arithmetic number, because the mean of its divisors is an integer number (4167180).

Almost surely, 2^28861393 is an apocalyptic number.

It is an amenable number.

28861393 is a deficient number, since it is larger than the sum of its proper divisors (4476047).

28861393 is a wasteful number, since it uses less digits than its factorization.

28861393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154367.

The product of its digits is 62208, while the sum is 40.

The square root of 28861393 is about 5372.2800559911. The cubic root of 28861393 is about 306.7414240924.

The spelling of 28861393 in words is "twenty-eight million, eight hundred sixty-one thousand, three hundred ninety-three".