28780190281 has 2 divisors, whose sum is σ = 28780190282. Its totient is φ = 28780190280.

The previous prime is 28780190261. The next prime is 28780190333. The reversal of 28780190281 is 18209108782.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21976580025 + 6803610256 = 148245^2 + 82484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28780190281 is a prime.

It is a super-2 number, since 2×28780190281² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28780190261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14390095140 + 14390095141.

It is an arithmetic number, because the mean of its divisors is an integer number (14390095141).

Almost surely, 2^28780190281 is an apocalyptic number.

It is an amenable number.

28780190281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28780190281 is an equidigital number, since it uses as much as digits as its factorization.

28780190281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 46.

The spelling of 28780190281 in words is "twenty-eight billion, seven hundred eighty million, one hundred ninety thousand, two hundred eighty-one".