28191314 has 4 divisors (see below), whose sum is σ = 42286974. Its totient is φ = 14095656.

The previous prime is 28191301. The next prime is 28191323. The reversal of 28191314 is 41319182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 41319182 = 2 ⋅20659591.

It can be written as a sum of positive squares in only one way, i.e., 20097289 + 8094025 = 4483^2 + 2845^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7047827 + ... + 7047830.

Almost surely, 2^28191314 is an apocalyptic number.

28191314 is a deficient number, since it is larger than the sum of its proper divisors (14095660).

28191314 is a wasteful number, since it uses less digits than its factorization.

28191314 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14095659.

The product of its digits is 1728, while the sum is 29.

The square root of 28191314 is about 5309.5493217410. The cubic root of 28191314 is about 304.3489255914.

The spelling of 28191314 in words is "twenty-eight million, one hundred ninety-one thousand, three hundred fourteen".