28693311 has 8 divisors (see below), whose sum is σ = 38283264. Its totient is φ = 19116120.

The previous prime is 28693309. The next prime is 28693319. The reversal of 28693311 is 11339682.

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

It is not a de Polignac number, because 28693311 - 2¹ = 28693309 is a prime.

It is a super-2 number, since 2×28693311² = 1646612192285442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28693319) 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 7 ways as a sum of consecutive naturals, for example, 5250 + ... + 9216.

It is an arithmetic number, because the mean of its divisors is an integer number (4785408).

Almost surely, 2^28693311 is an apocalyptic number.

28693311 is a deficient number, since it is larger than the sum of its proper divisors (9589953).

28693311 is a wasteful number, since it uses less digits than its factorization.

28693311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6381.

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

The square root of 28693311 is about 5356.6137624436. The cubic root of 28693311 is about 306.1448009632.

The spelling of 28693311 in words is "twenty-eight million, six hundred ninety-three thousand, three hundred eleven".