28300071781 has 2 divisors, whose sum is σ = 28300071782. Its totient is φ = 28300071780.

The previous prime is 28300071763. The next prime is 28300071809. The reversal of 28300071781 is 18717000382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20118869281 + 8181202500 = 141841^2 + 90450^2 .

It is a cyclic number.

It is not a de Polignac number, because 28300071781 - 2²⁷ = 28165854053 is a prime.

It is a super-2 number, since 2×28300071781² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28300071781.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28300071731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14150035890 + 14150035891.

It is an arithmetic number, because the mean of its divisors is an integer number (14150035891).

Almost surely, 2^28300071781 is an apocalyptic number.

It is an amenable number.

28300071781 is a deficient number, since it is larger than the sum of its proper divisors (1).

28300071781 is an equidigital number, since it uses as much as digits as its factorization.

28300071781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18816, while the sum is 37.

The spelling of 28300071781 in words is "twenty-eight billion, three hundred million, seventy-one thousand, seven hundred eighty-one".