28850605909 has 2 divisors, whose sum is σ = 28850605910. Its totient is φ = 28850605908.

The previous prime is 28850605859. The next prime is 28850605921. The reversal of 28850605909 is 90950605882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23448796900 + 5401809009 = 153130^2 + 73497^2 .

It is a cyclic number.

It is not a de Polignac number, because 28850605909 - 2¹⁹ = 28850081621 is a prime.

It is a super-2 number, since 2×28850605909² (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 (28850605709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14425302954 + 14425302955.

It is an arithmetic number, because the mean of its divisors is an integer number (14425302955).

Almost surely, 2^28850605909 is an apocalyptic number.

It is an amenable number.

28850605909 is a deficient number, since it is larger than the sum of its proper divisors (1).

28850605909 is an equidigital number, since it uses as much as digits as its factorization.

28850605909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1555200, while the sum is 52.

The spelling of 28850605909 in words is "twenty-eight billion, eight hundred fifty million, six hundred five thousand, nine hundred nine".