28923311497 has 2 divisors, whose sum is σ = 28923311498. Its totient is φ = 28923311496.

The previous prime is 28923311441. The next prime is 28923311513. The reversal of 28923311497 is 79411332982.

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., 23049008761 + 5874302736 = 151819^2 + 76644^2 .

It is a cyclic number.

It is not a de Polignac number, because 28923311497 - 2¹¹ = 28923309449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28923311497.

It is not a weakly prime, because it can be changed into another prime (28923411497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14461655748 + 14461655749.

It is an arithmetic number, because the mean of its divisors is an integer number (14461655749).

Almost surely, 2^28923311497 is an apocalyptic number.

It is an amenable number.

28923311497 is a deficient number, since it is larger than the sum of its proper divisors (1).

28923311497 is an equidigital number, since it uses as much as digits as its factorization.

28923311497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 49.

The spelling of 28923311497 in words is "twenty-eight billion, nine hundred twenty-three million, three hundred eleven thousand, four hundred ninety-seven".