28401193 has 4 divisors (see below), whose sum is σ = 28618128. Its totient is φ = 28184260.

The previous prime is 28401167. The next prime is 28401221. The reversal of 28401193 is 39110482.

It is a happy number.

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: 39110482 = 2 ⋅19555241.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28401193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28401103) 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, 108271 + ... + 108532.

It is an arithmetic number, because the mean of its divisors is an integer number (7154532).

Almost surely, 2^28401193 is an apocalyptic number.

It is an amenable number.

28401193 is a deficient number, since it is larger than the sum of its proper divisors (216935).

28401193 is a wasteful number, since it uses less digits than its factorization.

28401193 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216934.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28401193 is about 5329.2769678447. The cubic root of 28401193 is about 305.1023324093.

The spelling of 28401193 in words is "twenty-eight million, four hundred one thousand, one hundred ninety-three".