28904190869 has 2 divisors, whose sum is σ = 28904190870. Its totient is φ = 28904190868.

The previous prime is 28904190851. The next prime is 28904190877. The reversal of 28904190869 is 96809140982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19637818225 + 9266372644 = 140135^2 + 96262^2 .

It is a cyclic number.

It is not a de Polignac number, because 28904190869 - 2²⁸ = 28635755413 is a prime.

It is a super-2 number, since 2×28904190869² (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 (28904190899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14452095434 + 14452095435.

It is an arithmetic number, because the mean of its divisors is an integer number (14452095435).

Almost surely, 2^28904190869 is an apocalyptic number.

It is an amenable number.

28904190869 is a deficient number, since it is larger than the sum of its proper divisors (1).

28904190869 is an equidigital number, since it uses as much as digits as its factorization.

28904190869 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2239488, while the sum is 56.

The spelling of 28904190869 in words is "twenty-eight billion, nine hundred four million, one hundred ninety thousand, eight hundred sixty-nine".