28051171 has 4 divisors (see below), whose sum is σ = 28062952. Its totient is φ = 28039392.

The previous prime is 28051169. The next prime is 28051181. The reversal of 28051171 is 17115082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28051171 - 2¹ = 28051169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28051141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921 + ... + 7546.

It is an arithmetic number, because the mean of its divisors is an integer number (7015738).

Almost surely, 2^28051171 is an apocalyptic number.

28051171 is a deficient number, since it is larger than the sum of its proper divisors (11781).

28051171 is an equidigital number, since it uses as much as digits as its factorization.

28051171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11780.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 28051171 is about 5296.3356200301. The cubic root of 28051171 is about 303.8437671077.

The spelling of 28051171 in words is "twenty-eight million, fifty-one thousand, one hundred seventy-one".