28912329 has 8 divisors (see below), whose sum is σ = 42833120. Its totient is φ = 19274868.

The previous prime is 28912327. The next prime is 28912381. The reversal of 28912329 is 92321982.

It is not a de Polignac number, because 28912329 - 2¹ = 28912327 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28912293 and 28912302.

It is not an unprimeable number, because it can be changed into a prime (28912321) 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, 535387 + ... + 535440.

It is an arithmetic number, because the mean of its divisors is an integer number (5354140).

Almost surely, 2^28912329 is an apocalyptic number.

It is an amenable number.

28912329 is a deficient number, since it is larger than the sum of its proper divisors (13920791).

28912329 is a wasteful number, since it uses less digits than its factorization.

28912329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1070836 (or 1070830 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 28912329 is about 5377.0185976989. The cubic root of 28912329 is about 306.9217688034.

It can be divided in two parts, 28912 and 329, that added together give a square (29241 = 171²).

The spelling of 28912329 in words is "twenty-eight million, nine hundred twelve thousand, three hundred twenty-nine".