28981395524 has 12 divisors (see below), whose sum is σ = 53700821244. Its totient is φ = 13638303744.

The previous prime is 28981395523. The next prime is 28981395577. The reversal of 28981395524 is 42559318982.

It can be written as a sum of positive squares in 2 ways, for example, as 23475755524 + 5505640000 = 153218^2 + 74200^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28981395524.

It is not an unprimeable number, because it can be changed into a prime (28981395523) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213098429 + ... + 213098564.

It is an arithmetic number, because the mean of its divisors is an integer number (4475068437).

Almost surely, 2^28981395524 is an apocalyptic number.

It is an amenable number.

28981395524 is a deficient number, since it is larger than the sum of its proper divisors (24719425720).

28981395524 is a wasteful number, since it uses less digits than its factorization.

28981395524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426197014 (or 426197012 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 56.

The spelling of 28981395524 in words is "twenty-eight billion, nine hundred eighty-one million, three hundred ninety-five thousand, five hundred twenty-four".