28867161 has 4 divisors (see below), whose sum is σ = 38489552. Its totient is φ = 19244772.

The previous prime is 28867159. The next prime is 28867177. The reversal of 28867161 is 16176882.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28867161 - 2¹ = 28867159 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28867261) 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, 4811191 + ... + 4811196.

It is an arithmetic number, because the mean of its divisors is an integer number (9622388).

Almost surely, 2^28867161 is an apocalyptic number.

It is an amenable number.

28867161 is a deficient number, since it is larger than the sum of its proper divisors (9622391).

28867161 is an equidigital number, since it uses as much as digits as its factorization.

28867161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9622390.

The product of its digits is 32256, while the sum is 39.

The square root of 28867161 is about 5372.8168589670. The cubic root of 28867161 is about 306.7618570017.

The spelling of 28867161 in words is "twenty-eight million, eight hundred sixty-seven thousand, one hundred sixty-one".