28931361 has 8 divisors (see below), whose sum is σ = 38950080. Its totient is φ = 19100112.

The previous prime is 28931347. The next prime is 28931369. The reversal of 28931361 is 16313982.

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

It is not a de Polignac number, because 28931361 - 2¹⁹ = 28407073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28931369) 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, 46506 + ... + 47123.

It is an arithmetic number, because the mean of its divisors is an integer number (4868760).

Almost surely, 2^28931361 is an apocalyptic number.

It is an amenable number.

28931361 is a deficient number, since it is larger than the sum of its proper divisors (10018719).

28931361 is a wasteful number, since it uses less digits than its factorization.

28931361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93735.

The product of its digits is 7776, while the sum is 33.

The square root of 28931361 is about 5378.7880605207. The cubic root of 28931361 is about 306.9890994089.

It can be divided in two parts, 28931 and 361, that added together give a palindrome (29292).

The spelling of 28931361 in words is "twenty-eight million, nine hundred thirty-one thousand, three hundred sixty-one".