28226491493 has 2 divisors, whose sum is σ = 28226491494. Its totient is φ = 28226491492.

The previous prime is 28226491477. The next prime is 28226491547. The reversal of 28226491493 is 39419462282.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25054774369 + 3171717124 = 158287^2 + 56318^2 .

It is a cyclic number.

It is not a de Polignac number, because 28226491493 - 2⁴ = 28226491477 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28226491193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14113245746 + 14113245747.

It is an arithmetic number, because the mean of its divisors is an integer number (14113245747).

Almost surely, 2^28226491493 is an apocalyptic number.

It is an amenable number.

28226491493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28226491493 is an equidigital number, since it uses as much as digits as its factorization.

28226491493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 50.

The spelling of 28226491493 in words is "twenty-eight billion, two hundred twenty-six million, four hundred ninety-one thousand, four hundred ninety-three".