28497443977 has 2 divisors, whose sum is σ = 28497443978. Its totient is φ = 28497443976.

The previous prime is 28497443963. The next prime is 28497443983. The reversal of 28497443977 is 77934479482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23651056521 + 4846387456 = 153789^2 + 69616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28497443977 is a prime.

It is not a weakly prime, because it can be changed into another prime (28497443917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14248721988 + 14248721989.

It is an arithmetic number, because the mean of its divisors is an integer number (14248721989).

Almost surely, 2^28497443977 is an apocalyptic number.

It is an amenable number.

28497443977 is a deficient number, since it is larger than the sum of its proper divisors (1).

28497443977 is an equidigital number, since it uses as much as digits as its factorization.

28497443977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85349376, while the sum is 64.

The spelling of 28497443977 in words is "twenty-eight billion, four hundred ninety-seven million, four hundred forty-three thousand, nine hundred seventy-seven".