28868121 has 12 divisors (see below), whose sum is σ = 41950272. Its totient is φ = 19129176.

The previous prime is 28868117. The next prime is 28868149. The reversal of 28868121 is 12186882.

It is not a de Polignac number, because 28868121 - 2² = 28868117 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28868221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8101 + ... + 11106.

It is an arithmetic number, because the mean of its divisors is an integer number (3495856).

Almost surely, 2^28868121 is an apocalyptic number.

It is an amenable number.

28868121 is a deficient number, since it is larger than the sum of its proper divisors (13082151).

28868121 is a wasteful number, since it uses less digits than its factorization.

28868121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19380 (or 19377 counting only the distinct ones).

The product of its digits is 12288, while the sum is 36.

The square root of 28868121 is about 5372.9061968361. The cubic root of 28868121 is about 306.7652574992.

The spelling of 28868121 in words is "twenty-eight million, eight hundred sixty-eight thousand, one hundred twenty-one".