28969905 has 16 divisors (see below), whose sum is σ = 46912320. Its totient is φ = 15263808.

The previous prime is 28969901. The next prime is 28969909. The reversal of 28969905 is 50996982.

It is an interprime number because it is at equal distance from previous prime (28969901) and next prime (28969909).

It is not a de Polignac number, because 28969905 - 2² = 28969901 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28969901) 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 15 ways as a sum of consecutive naturals, for example, 10390 + ... + 12879.

It is an arithmetic number, because the mean of its divisors is an integer number (2932020).

Almost surely, 2^28969905 is an apocalyptic number.

It is an amenable number.

28969905 is a deficient number, since it is larger than the sum of its proper divisors (17942415).

28969905 is a wasteful number, since it uses less digits than its factorization.

28969905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23360.

The product of its (nonzero) digits is 349920, while the sum is 48.

The square root of 28969905 is about 5382.3698312175. The cubic root of 28969905 is about 307.1253683416.

The spelling of 28969905 in words is "twenty-eight million, nine hundred sixty-nine thousand, nine hundred five".