28194951 has 4 divisors (see below), whose sum is σ = 37593272. Its totient is φ = 18796632.

The previous prime is 28194937. The next prime is 28194953. The reversal of 28194951 is 15949182.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28194951 - 2⁵ = 28194919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28194953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4699156 + ... + 4699161.

It is an arithmetic number, because the mean of its divisors is an integer number (9398318).

Almost surely, 2^28194951 is an apocalyptic number.

28194951 is a deficient number, since it is larger than the sum of its proper divisors (9398321).

28194951 is an equidigital number, since it uses as much as digits as its factorization.

28194951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9398320.

The product of its digits is 25920, while the sum is 39.

The square root of 28194951 is about 5309.8918068074. The cubic root of 28194951 is about 304.3620131857.

The spelling of 28194951 in words is "twenty-eight million, one hundred ninety-four thousand, nine hundred fifty-one".