28331469 has 48 divisors (see below), whose sum is σ = 46230912. Its totient is φ = 16625664.

The previous prime is 28331467. The next prime is 28331477. The reversal of 28331469 is 96413382.

28331469 is a `hidden beast` number, since 283 + 314 + 69 = 666.

It is not a de Polignac number, because 28331469 - 2¹ = 28331467 is a prime.

It is a super-2 number, since 2×28331469² = 1605344271395922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28331461) 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 47 ways as a sum of consecutive naturals, for example, 292029 + ... + 292125.

It is an arithmetic number, because the mean of its divisors is an integer number (963144).

Almost surely, 2^28331469 is an apocalyptic number.

It is an amenable number.

28331469 is a deficient number, since it is larger than the sum of its proper divisors (17899443).

28331469 is a wasteful number, since it uses less digits than its factorization.

28331469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226 (or 223 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 28331469 is about 5322.7313477199. The cubic root of 28331469 is about 304.8524557352.

The spelling of 28331469 in words is "twenty-eight million, three hundred thirty-one thousand, four hundred sixty-nine".