28623203281 has 2 divisors, whose sum is σ = 28623203282. Its totient is φ = 28623203280.

The previous prime is 28623203243. The next prime is 28623203341. The reversal of 28623203281 is 18230232682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16088385600 + 12534817681 = 126840^2 + 111959^2 .

It is a cyclic number.

It is not a de Polignac number, because 28623203281 - 2²⁵ = 28589648849 is a prime.

It is a super-2 number, since 2×28623203281² (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 28623203281.

It is not a weakly prime, because it can be changed into another prime (28623203381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14311601640 + 14311601641.

It is an arithmetic number, because the mean of its divisors is an integer number (14311601641).

Almost surely, 2^28623203281 is an apocalyptic number.

It is an amenable number.

28623203281 is a deficient number, since it is larger than the sum of its proper divisors (1).

28623203281 is an equidigital number, since it uses as much as digits as its factorization.

28623203281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The spelling of 28623203281 in words is "twenty-eight billion, six hundred twenty-three million, two hundred three thousand, two hundred eighty-one".