28684841956 has 27 divisors (see below), whose sum is σ = 52991441769. Its totient is φ = 13584508128.

The previous prime is 28684841951. The next prime is 28684841957. The reversal of 28684841956 is 65914848682.

The square root of 28684841956 is 169366.

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., 20144124900 + 8540717056 = 141930^2 + 92416^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28684841894 and 28684841903.

It is not an unprimeable number, because it can be changed into a prime (28684841951) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6433680 + ... + 6438136.

Almost surely, 2^28684841956 is an apocalyptic number.

28684841956 is the 169366-th square number.

It is an amenable number.

28684841956 is a deficient number, since it is larger than the sum of its proper divisors (24306599813).

28684841956 is an frugal number, since it uses more digits than its factorization.

28684841956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8956 (or 4478 counting only the distinct ones).

The product of its digits is 26542080, while the sum is 61.

The spelling of 28684841956 in words is "twenty-eight billion, six hundred eighty-four million, eight hundred forty-one thousand, nine hundred fifty-six".