28935853981 has 8 divisors (see below), whose sum is σ = 29447563320. Its totient is φ = 28428499968.

The previous prime is 28935853937. The next prime is 28935853993. The reversal of 28935853981 is 18935853982.

It can be written as a sum of positive squares in 4 ways, for example, as 701773081 + 28234080900 = 26491^2 + 168030^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28935853981 - 2¹¹ = 28935851933 is a prime.

It is a super-2 number, since 2×28935853981² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28935853931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1075426 + ... + 1102003.

It is an arithmetic number, because the mean of its divisors is an integer number (3680945415).

Almost surely, 2^28935853981 is an apocalyptic number.

It is an amenable number.

28935853981 is a deficient number, since it is larger than the sum of its proper divisors (511709339).

28935853981 is a wasteful number, since it uses less digits than its factorization.

28935853981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2177663.

The product of its digits is 18662400, while the sum is 61.

Subtracting from 28935853981 its reverse (18935853982), we obtain a palindrome (9999999999).

The spelling of 28935853981 in words is "twenty-eight billion, nine hundred thirty-five million, eight hundred fifty-three thousand, nine hundred eighty-one".