28172141 has 4 divisors (see below), whose sum is σ = 28224192. Its totient is φ = 28120092.

The previous prime is 28172069. The next prime is 28172147. The reversal of 28172141 is 14127182.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14127182 = 2 ⋅7063591.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28172141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28172141.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28172147) 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, 25205 + ... + 26298.

It is an arithmetic number, because the mean of its divisors is an integer number (7056048).

Almost surely, 2^28172141 is an apocalyptic number.

It is an amenable number.

28172141 is a deficient number, since it is larger than the sum of its proper divisors (52051).

28172141 is an equidigital number, since it uses as much as digits as its factorization.

28172141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52050.

The product of its digits is 896, while the sum is 26.

The square root of 28172141 is about 5307.7434941790. The cubic root of 28172141 is about 304.2799137282.

The spelling of 28172141 in words is "twenty-eight million, one hundred seventy-two thousand, one hundred forty-one".