28669911 has 8 divisors (see below), whose sum is σ = 38298624. Its totient is φ = 19077240.

The previous prime is 28669897. The next prime is 28669919. The reversal of 28669911 is 11996682.

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

It is not a de Polignac number, because 28669911 - 2¹⁵ = 28637143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28669919) 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, 7095 + ... + 10376.

It is an arithmetic number, because the mean of its divisors is an integer number (4787328).

Almost surely, 2^28669911 is an apocalyptic number.

28669911 is a deficient number, since it is larger than the sum of its proper divisors (9628713).

28669911 is a wasteful number, since it uses less digits than its factorization.

28669911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18021.

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

The square root of 28669911 is about 5354.4291012208. The cubic root of 28669911 is about 306.0615558167.

The spelling of 28669911 in words is "twenty-eight million, six hundred sixty-nine thousand, nine hundred eleven".