28969397 has 4 divisors (see below), whose sum is σ = 30228960. Its totient is φ = 27709836.

The previous prime is 28969387. The next prime is 28969403. The reversal of 28969397 is 79396982.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28969397 - 2⁸ = 28969141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28969307) 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 3 ways as a sum of consecutive naturals, for example, 629747 + ... + 629792.

It is an arithmetic number, because the mean of its divisors is an integer number (7557240).

Almost surely, 2^28969397 is an apocalyptic number.

It is an amenable number.

28969397 is a deficient number, since it is larger than the sum of its proper divisors (1259563).

28969397 is a wasteful number, since it uses less digits than its factorization.

28969397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259562.

The product of its digits is 1469664, while the sum is 53.

The square root of 28969397 is about 5382.3226399018. The cubic root of 28969397 is about 307.1235731383.

The spelling of 28969397 in words is "twenty-eight million, nine hundred sixty-nine thousand, three hundred ninety-seven".