28485735356681 has 4 divisors (see below), whose sum is σ = 29984984586000. Its totient is φ = 26986486127364.

The previous prime is 28485735356633. The next prime is 28485735356699. The reversal of 28485735356681 is 18665353758482.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28485735356681 - 2³⁸ = 28210857449737 is a prime.

It is a super-2 number, since 2×28485735356681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28485735356621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 749624614631 + ... + 749624614668.

It is an arithmetic number, because the mean of its divisors is an integer number (7496246146500).

Almost surely, 2^{28485735356681} is an apocalyptic number.

It is an amenable number.

28485735356681 is a deficient number, since it is larger than the sum of its proper divisors (1499249229319).

28485735356681 is a wasteful number, since it uses less digits than its factorization.

28485735356681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1499249229318.

The product of its digits is 1161216000, while the sum is 71.

The spelling of 28485735356681 in words is "twenty-eight trillion, four hundred eighty-five billion, seven hundred thirty-five million, three hundred fifty-six thousand, six hundred eighty-one".