28788050581 has 2 divisors, whose sum is σ = 28788050582. Its totient is φ = 28788050580.

The previous prime is 28788050567. The next prime is 28788050587. The reversal of 28788050581 is 18505088782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19799304100 + 8988746481 = 140710^2 + 94809^2 .

It is a cyclic number.

It is not a de Polignac number, because 28788050581 - 2⁷ = 28788050453 is a prime.

It is a super-2 number, since 2×28788050581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28788050587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14394025290 + 14394025291.

It is an arithmetic number, because the mean of its divisors is an integer number (14394025291).

Almost surely, 2^28788050581 is an apocalyptic number.

It is an amenable number.

28788050581 is a deficient number, since it is larger than the sum of its proper divisors (1).

28788050581 is an equidigital number, since it uses as much as digits as its factorization.

28788050581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1433600, while the sum is 52.

The spelling of 28788050581 in words is "twenty-eight billion, seven hundred eighty-eight million, fifty thousand, five hundred eighty-one".