28122237397 has 2 divisors, whose sum is σ = 28122237398. Its totient is φ = 28122237396.

The previous prime is 28122237347. The next prime is 28122237463. The reversal of 28122237397 is 79373222182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28049885361 + 72352036 = 167481^2 + 8506^2 .

It is a cyclic number.

It is not a de Polignac number, because 28122237397 - 2¹⁵ = 28122204629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28122237347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14061118698 + 14061118699.

It is an arithmetic number, because the mean of its divisors is an integer number (14061118699).

Almost surely, 2^28122237397 is an apocalyptic number.

It is an amenable number.

28122237397 is a deficient number, since it is larger than the sum of its proper divisors (1).

28122237397 is an equidigital number, since it uses as much as digits as its factorization.

28122237397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 46.

The spelling of 28122237397 in words is "twenty-eight billion, one hundred twenty-two million, two hundred thirty-seven thousand, three hundred ninety-seven".