28372135991 has 2 divisors, whose sum is σ = 28372135992. Its totient is φ = 28372135990.

The previous prime is 28372135973. The next prime is 28372136003. The reversal of 28372135991 is 19953127382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28372135991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28372135901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14186067995 + 14186067996.

It is an arithmetic number, because the mean of its divisors is an integer number (14186067996).

Almost surely, 2^28372135991 is an apocalyptic number.

28372135991 is a deficient number, since it is larger than the sum of its proper divisors (1).

28372135991 is an equidigital number, since it uses as much as digits as its factorization.

28372135991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 50.

The spelling of 28372135991 in words is "twenty-eight billion, three hundred seventy-two million, one hundred thirty-five thousand, nine hundred ninety-one".