28785590773 has 2 divisors, whose sum is σ = 28785590774. Its totient is φ = 28785590772.

The previous prime is 28785590747. The next prime is 28785590777. The reversal of 28785590773 is 37709558782.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26065133809 + 2720456964 = 161447^2 + 52158^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28785590773 is a prime.

It is a super-2 number, since 2×28785590773² (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 (28785590777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14392795386 + 14392795387.

It is an arithmetic number, because the mean of its divisors is an integer number (14392795387).

Almost surely, 2^28785590773 is an apocalyptic number.

It is an amenable number.

28785590773 is a deficient number, since it is larger than the sum of its proper divisors (1).

28785590773 is an equidigital number, since it uses as much as digits as its factorization.

28785590773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 29635200, while the sum is 61.

The spelling of 28785590773 in words is "twenty-eight billion, seven hundred eighty-five million, five hundred ninety thousand, seven hundred seventy-three".