27643745783824 has 15 divisors (see below), whose sum is σ = 53559798203613. Its totient is φ = 13821862376448.

The previous prime is 27643745783767. The next prime is 27643745783827. The reversal of 27643745783824 is 42838754734672.

The square root of 27643745783824 is 5257732.

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., 51501763600 + 27592244020224 = 226940^2 + 5252832^2 .

It is a super-2 number, since 2×27643745783824² (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 (27643745783827) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20373712 + ... + 21688144.

Almost surely, 2^{27643745783824} is an apocalyptic number.

27643745783824 is the 5257732-nd square number.

It is an amenable number.

27643745783824 is a deficient number, since it is larger than the sum of its proper divisors (25916052419789).

27643745783824 is an frugal number, since it uses more digits than its factorization.

27643745783824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628874 (or 1314435 counting only the distinct ones).

The product of its digits is 1517322240, while the sum is 70.

The spelling of 27643745783824 in words is "twenty-seven trillion, six hundred forty-three billion, seven hundred forty-five million, seven hundred eighty-three thousand, eight hundred twenty-four".