28511121 has 8 divisors (see below), whose sum is σ = 38384320. Its totient is φ = 18822672.

The previous prime is 28511117. The next prime is 28511123. The reversal of 28511121 is 12111582.

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

It is not a de Polignac number, because 28511121 - 2² = 28511117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28511123) 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, 45826 + ... + 46443.

It is an arithmetic number, because the mean of its divisors is an integer number (4798040).

Almost surely, 2^28511121 is an apocalyptic number.

It is an amenable number.

28511121 is a deficient number, since it is larger than the sum of its proper divisors (9873199).

28511121 is a wasteful number, since it uses less digits than its factorization.

28511121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92375.

The product of its digits is 160, while the sum is 21.

The square root of 28511121 is about 5339.5806015079. The cubic root of 28511121 is about 305.4954627292.

The spelling of 28511121 in words is "twenty-eight million, five hundred eleven thousand, one hundred twenty-one".