28331011 has 8 divisors (see below), whose sum is σ = 29167280. Its totient is φ = 27498528.

The previous prime is 28331003. The next prime is 28331029. The reversal of 28331011 is 11013382.

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

It is a cyclic number.

It is not a de Polignac number, because 28331011 - 2³ = 28331003 is a prime.

It is a super-3 number, since 3×28331011³ (a number of 23 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28331011.

It is not an unprimeable number, because it can be changed into a prime (28331411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22285 + ... + 23521.

It is an arithmetic number, because the mean of its divisors is an integer number (3645910).

Almost surely, 2^28331011 is an apocalyptic number.

28331011 is a deficient number, since it is larger than the sum of its proper divisors (836269).

28331011 is a wasteful number, since it uses less digits than its factorization.

28331011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893.

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

The square root of 28331011 is about 5322.6883245217. The cubic root of 28331011 is about 304.8508130015.

Adding to 28331011 its reverse (11013382), we get a palindrome (39344393).

It can be divided in two parts, 2833 and 1011, that added together give a square (3844 = 62²).

The spelling of 28331011 in words is "twenty-eight million, three hundred thirty-one thousand, eleven".