28427934989 has 2 divisors, whose sum is σ = 28427934990. Its totient is φ = 28427934988.

The previous prime is 28427934923. The next prime is 28427935031. The reversal of 28427934989 is 98943972482.

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., 18658194025 + 9769740964 = 136595^2 + 98842^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28427934989 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 (28427930989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14213967494 + 14213967495.

It is an arithmetic number, because the mean of its divisors is an integer number (14213967495).

Almost surely, 2^28427934989 is an apocalyptic number.

It is an amenable number.

28427934989 is a deficient number, since it is larger than the sum of its proper divisors (1).

28427934989 is an equidigital number, since it uses as much as digits as its factorization.

28427934989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62705664, while the sum is 65.

The spelling of 28427934989 in words is "twenty-eight billion, four hundred twenty-seven million, nine hundred thirty-four thousand, nine hundred eighty-nine".