28542785969 has 2 divisors, whose sum is σ = 28542785970. Its totient is φ = 28542785968.

The previous prime is 28542785933. The next prime is 28542785989. The reversal of 28542785969 is 96958724582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21522357025 + 7020428944 = 146705^2 + 83788^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28542785969 is a prime.

It is a super-2 number, since 2×28542785969² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28542785989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14271392984 + 14271392985.

It is an arithmetic number, because the mean of its divisors is an integer number (14271392985).

Almost surely, 2^28542785969 is an apocalyptic number.

It is an amenable number.

28542785969 is a deficient number, since it is larger than the sum of its proper divisors (1).

28542785969 is an equidigital number, since it uses as much as digits as its factorization.

28542785969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 87091200, while the sum is 65.

The spelling of 28542785969 in words is "twenty-eight billion, five hundred forty-two million, seven hundred eighty-five thousand, nine hundred sixty-nine".