28467922981 has 2 divisors, whose sum is σ = 28467922982. Its totient is φ = 28467922980.

The previous prime is 28467922979. The next prime is 28467922997. The reversal of 28467922981 is 18922976482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27434621956 + 1033301025 = 165634^2 + 32145^2 .

It is a cyclic number.

It is not a de Polignac number, because 28467922981 - 2¹ = 28467922979 is a prime.

It is a super-2 number, since 2×28467922981² (a number of 22 digits) contains 22 as substring.

Together with 28467922979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28467922961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14233961490 + 14233961491.

It is an arithmetic number, because the mean of its divisors is an integer number (14233961491).

Almost surely, 2^28467922981 is an apocalyptic number.

It is an amenable number.

28467922981 is a deficient number, since it is larger than the sum of its proper divisors (1).

28467922981 is an equidigital number, since it uses as much as digits as its factorization.

28467922981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6967296, while the sum is 58.

The spelling of 28467922981 in words is "twenty-eight billion, four hundred sixty-seven million, nine hundred twenty-two thousand, nine hundred eighty-one".