28601204581 has 2 divisors, whose sum is σ = 28601204582. Its totient is φ = 28601204580.

The previous prime is 28601204503. The next prime is 28601204591. The reversal of 28601204581 is 18540210682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25265102500 + 3336102081 = 158950^2 + 57759^2 .

It is a cyclic number.

It is not a de Polignac number, because 28601204581 - 2¹⁵ = 28601171813 is a prime.

It is a super-2 number, since 2×28601204581² (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 28601204581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28601204591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14300602290 + 14300602291.

It is an arithmetic number, because the mean of its divisors is an integer number (14300602291).

Almost surely, 2^28601204581 is an apocalyptic number.

It is an amenable number.

28601204581 is a deficient number, since it is larger than the sum of its proper divisors (1).

28601204581 is an equidigital number, since it uses as much as digits as its factorization.

28601204581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 28601204581 in words is "twenty-eight billion, six hundred one million, two hundred four thousand, five hundred eighty-one".