28493311 has 16 divisors (see below), whose sum is σ = 35642880. Its totient is φ = 22128480.

The previous prime is 28493303. The next prime is 28493321. The reversal of 28493311 is 11339482.

It is not a de Polignac number, because 28493311 - 2³ = 28493303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28493321) 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 15 ways as a sum of consecutive naturals, for example, 38830 + ... + 39556.

It is an arithmetic number, because the mean of its divisors is an integer number (2227680).

Almost surely, 2^28493311 is an apocalyptic number.

28493311 is a deficient number, since it is larger than the sum of its proper divisors (7149569).

28493311 is a wasteful number, since it uses less digits than its factorization.

28493311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254.

The product of its digits is 5184, while the sum is 31.

The square root of 28493311 is about 5337.9126070029. The cubic root of 28493311 is about 305.4318383455.

The spelling of 28493311 in words is "twenty-eight million, four hundred ninety-three thousand, three hundred eleven".