28941909 has 8 divisors (see below), whose sum is σ = 38848800. Its totient is φ = 19164816.

The previous prime is 28941901. The next prime is 28941929. The reversal of 28941909 is 90914982.

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

It is not a de Polignac number, because 28941909 - 2³ = 28941901 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28941901) 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, 31927 + ... + 32820.

It is an arithmetic number, because the mean of its divisors is an integer number (4856100).

Almost surely, 2^28941909 is an apocalyptic number.

It is an amenable number.

28941909 is a deficient number, since it is larger than the sum of its proper divisors (9906891).

28941909 is a wasteful number, since it uses less digits than its factorization.

28941909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64899.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 28941909 is about 5379.7684894426. The cubic root of 28941909 is about 307.0264029607.

The spelling of 28941909 in words is "twenty-eight million, nine hundred forty-one thousand, nine hundred nine".