28207717949 has 2 divisors, whose sum is σ = 28207717950. Its totient is φ = 28207717948.

The previous prime is 28207717931. The next prime is 28207717957. The reversal of 28207717949 is 94971770282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17435353849 + 10772364100 = 132043^2 + 103790^2 .

It is a cyclic number.

It is not a de Polignac number, because 28207717949 - 2⁸ = 28207717693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28207717894 and 28207717903.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28207713949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14103858974 + 14103858975.

It is an arithmetic number, because the mean of its divisors is an integer number (14103858975).

Almost surely, 2^28207717949 is an apocalyptic number.

It is an amenable number.

28207717949 is a deficient number, since it is larger than the sum of its proper divisors (1).

28207717949 is an equidigital number, since it uses as much as digits as its factorization.

28207717949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3556224, while the sum is 56.

The spelling of 28207717949 in words is "twenty-eight billion, two hundred seven million, seven hundred seventeen thousand, nine hundred forty-nine".