28531939396 has 9 divisors (see below), whose sum is σ = 49931485149. Its totient is φ = 14265800784.

The previous prime is 28531939363. The next prime is 28531939439. The reversal of 28531939396 is 69393913582.

The square root of 28531939396 is 168914.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 18438924100 + 10093015296 = 135790^2 + 100464^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28531939396.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 295600 + ... + 380056.

Almost surely, 2^28531939396 is an apocalyptic number.

28531939396 is the 168914-th square number.

It is an amenable number.

28531939396 is a deficient number, since it is larger than the sum of its proper divisors (21399545753).

28531939396 is an frugal number, since it uses more digits than its factorization.

28531939396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168918 (or 84459 counting only the distinct ones).

The product of its digits is 9447840, while the sum is 58.

The spelling of 28531939396 in words is "twenty-eight billion, five hundred thirty-one million, nine hundred thirty-nine thousand, three hundred ninety-six".