28730171 has 4 divisors (see below), whose sum is σ = 28763592. Its totient is φ = 28696752.

The previous prime is 28730161. The next prime is 28730183. The reversal of 28730171 is 17103782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17103782 = 2 ⋅8551891.

It is a cyclic number.

It is not a de Polignac number, because 28730171 - 2¹⁴ = 28713787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28730131) 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, 15386 + ... + 17151.

It is an arithmetic number, because the mean of its divisors is an integer number (7190898).

Almost surely, 2^28730171 is an apocalyptic number.

28730171 is a deficient number, since it is larger than the sum of its proper divisors (33421).

28730171 is an equidigital number, since it uses as much as digits as its factorization.

28730171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33420.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 28730171 is about 5360.0532646607. The cubic root of 28730171 is about 306.2758381088.

The spelling of 28730171 in words is "twenty-eight million, seven hundred thirty thousand, one hundred seventy-one".