28243552957 has 2 divisors, whose sum is σ = 28243552958. Its totient is φ = 28243552956.

The previous prime is 28243552937. The next prime is 28243552963. The reversal of 28243552957 is 75925534282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27359144836 + 884408121 = 165406^2 + 29739^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28243552957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28243552907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14121776478 + 14121776479.

It is an arithmetic number, because the mean of its divisors is an integer number (14121776479).

Almost surely, 2^28243552957 is an apocalyptic number.

It is an amenable number.

28243552957 is a deficient number, since it is larger than the sum of its proper divisors (1).

28243552957 is an equidigital number, since it uses as much as digits as its factorization.

28243552957 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6048000, while the sum is 52.

The spelling of 28243552957 in words is "twenty-eight billion, two hundred forty-three million, five hundred fifty-two thousand, nine hundred fifty-seven".