28192001 has 4 divisors (see below), whose sum is σ = 29850372. Its totient is φ = 26533632.

The previous prime is 28191979. The next prime is 28192037. The reversal of 28192001 is 10029182.

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

It can be written as a sum of positive squares in 2 ways, for example, as 18105025 + 10086976 = 4255^2 + 3176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28192001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28192061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 829160 + ... + 829193.

It is an arithmetic number, because the mean of its divisors is an integer number (7462593).

Almost surely, 2^28192001 is an apocalyptic number.

It is an amenable number.

28192001 is a deficient number, since it is larger than the sum of its proper divisors (1658371).

28192001 is a wasteful number, since it uses less digits than its factorization.

28192001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1658370.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 28192001 is about 5309.6140161032. The cubic root of 28192001 is about 304.3513978188.

The spelling of 28192001 in words is "twenty-eight million, one hundred ninety-two thousand, one".