28458764881 has 4 divisors (see below), whose sum is σ = 30132809892. Its totient is φ = 26784719872.

The previous prime is 28458764861. The next prime is 28458764923. The reversal of 28458764881 is 18846785482.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18289857600 + 10168907281 = 135240^2 + 100841^2 .

It is a cyclic number.

It is not a de Polignac number, because 28458764881 - 2¹¹ = 28458762833 is a prime.

It is a super-2 number, since 2×28458764881² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28458764821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 837022480 + ... + 837022513.

It is an arithmetic number, because the mean of its divisors is an integer number (7533202473).

Almost surely, 2^28458764881 is an apocalyptic number.

It is an amenable number.

28458764881 is a deficient number, since it is larger than the sum of its proper divisors (1674045011).

28458764881 is a wasteful number, since it uses less digits than its factorization.

28458764881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1674045010.

The product of its digits is 27525120, while the sum is 61.

The spelling of 28458764881 in words is "twenty-eight billion, four hundred fifty-eight million, seven hundred sixty-four thousand, eight hundred eighty-one".