28011232493 has 2 divisors, whose sum is σ = 28011232494. Its totient is φ = 28011232492.

The previous prime is 28011232463. The next prime is 28011232517. The reversal of 28011232493 is 39423211082.

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., 17328563044 + 10682669449 = 131638^2 + 103357^2 .

It is a cyclic number.

It is not a de Polignac number, because 28011232493 - 2⁸ = 28011232237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28011232453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14005616246 + 14005616247.

It is an arithmetic number, because the mean of its divisors is an integer number (14005616247).

Almost surely, 2^28011232493 is an apocalyptic number.

It is an amenable number.

28011232493 is a deficient number, since it is larger than the sum of its proper divisors (1).

28011232493 is an equidigital number, since it uses as much as digits as its factorization.

28011232493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 28011232493 in words is "twenty-eight billion, eleven million, two hundred thirty-two thousand, four hundred ninety-three".