28130311 has 8 divisors (see below), whose sum is σ = 32022144. Its totient is φ = 24460920.

The previous prime is 28130303. The next prime is 28130321. The reversal of 28130311 is 11303182.

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

It is not a de Polignac number, because 28130311 - 2³ = 28130303 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130321) 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, 55341 + ... + 55846.

It is an arithmetic number, because the mean of its divisors is an integer number (4002768).

Almost surely, 2^28130311 is an apocalyptic number.

28130311 is a deficient number, since it is larger than the sum of its proper divisors (3891833).

28130311 is a wasteful number, since it uses less digits than its factorization.

28130311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111221.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 28130311 is about 5303.8015611446. The cubic root of 28130311 is about 304.1292408404.

Adding to 28130311 its reverse (11303182), we get a palindrome (39433493).

It can be divided in two parts, 28130 and 311, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 28130311 in words is "twenty-eight million, one hundred thirty thousand, three hundred eleven".