28881230377 has 2 divisors, whose sum is σ = 28881230378. Its totient is φ = 28881230376.

The previous prime is 28881230363. The next prime is 28881230407. The reversal of 28881230377 is 77303218882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27194978281 + 1686252096 = 164909^2 + 41064^2 .

It is a cyclic number.

It is not a de Polignac number, because 28881230377 - 2¹⁹ = 28880706089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28881230377.

It is not a weakly prime, because it can be changed into another prime (28881237377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14440615188 + 14440615189.

It is an arithmetic number, because the mean of its divisors is an integer number (14440615189).

Almost surely, 2^28881230377 is an apocalyptic number.

It is an amenable number.

28881230377 is a deficient number, since it is larger than the sum of its proper divisors (1).

28881230377 is an equidigital number, since it uses as much as digits as its factorization.

28881230377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 49.

The spelling of 28881230377 in words is "twenty-eight billion, eight hundred eighty-one million, two hundred thirty thousand, three hundred seventy-seven".