28194497 has 2 divisors, whose sum is σ = 28194498. Its totient is φ = 28194496.

The previous prime is 28194493. The next prime is 28194503. The reversal of 28194497 is 79449182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22429696 + 5764801 = 4736^2 + 2401^2 .

It is a cyclic number.

It is not a de Polignac number, because 28194497 - 2² = 28194493 is a prime.

It is a super-2 number, since 2×28194497² = 1589859322166018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28194493) 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 as a sum of consecutive naturals, namely, 14097248 + 14097249.

It is an arithmetic number, because the mean of its divisors is an integer number (14097249).

Almost surely, 2^28194497 is an apocalyptic number.

It is an amenable number.

28194497 is a deficient number, since it is larger than the sum of its proper divisors (1).

28194497 is an equidigital number, since it uses as much as digits as its factorization.

28194497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 44.

The square root of 28194497 is about 5309.8490562350. The cubic root of 28194497 is about 304.3603795470.

The spelling of 28194497 in words is "twenty-eight million, one hundred ninety-four thousand, four hundred ninety-seven".