28821171 has 16 divisors (see below), whose sum is σ = 40950144. Its totient is φ = 17967744.

The previous prime is 28821161. The next prime is 28821181. The reversal of 28821171 is 17112882.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28821161) and next prime (28821181).

It is not a de Polignac number, because 28821171 - 2¹¹ = 28819123 is a prime.

It is a super-2 number, since 2×28821171² = 1661319795622482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28821131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6580 + ... + 10046.

It is an arithmetic number, because the mean of its divisors is an integer number (2559384).

Almost surely, 2^28821171 is an apocalyptic number.

28821171 is a deficient number, since it is larger than the sum of its proper divisors (12128973).

28821171 is a wasteful number, since it uses less digits than its factorization.

28821171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650.

The product of its digits is 1792, while the sum is 30.

The square root of 28821171 is about 5368.5352751006. The cubic root of 28821171 is about 306.5988635282.

The spelling of 28821171 in words is "twenty-eight million, eight hundred twenty-one thousand, one hundred seventy-one".