28416331393 has 2 divisors, whose sum is σ = 28416331394. Its totient is φ = 28416331392.

The previous prime is 28416331369. The next prime is 28416331399. The reversal of 28416331393 is 39313361482.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25671409729 + 2744921664 = 160223^2 + 52392^2 .

It is a cyclic number.

It is not a de Polignac number, because 28416331393 - 2²¹ = 28414234241 is a prime.

It is not a weakly prime, because it can be changed into another prime (28416331399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14208165696 + 14208165697.

It is an arithmetic number, because the mean of its divisors is an integer number (14208165697).

Almost surely, 2^28416331393 is an apocalyptic number.

It is an amenable number.

28416331393 is a deficient number, since it is larger than the sum of its proper divisors (1).

28416331393 is an equidigital number, since it uses as much as digits as its factorization.

28416331393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 43.

The spelling of 28416331393 in words is "twenty-eight billion, four hundred sixteen million, three hundred thirty-one thousand, three hundred ninety-three".