681448823 has 24 divisors (see below), whose sum is σ = 770387760. Its totient is φ = 597747200.

The previous prime is 681448819. The next prime is 681448829. The reversal of 681448823 is 328844186.

It is not a de Polignac number, because 681448823 - 2² = 681448819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681448829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2533133 + ... + 2533401.

It is an arithmetic number, because the mean of its divisors is an integer number (32099490).

Almost surely, 2^681448823 is an apocalyptic number.

681448823 is a deficient number, since it is larger than the sum of its proper divisors (88938937).

681448823 is a wasteful number, since it uses less digits than its factorization.

681448823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499 (or 458 counting only the distinct ones).

The product of its digits is 294912, while the sum is 44.

The square root of 681448823 is about 26104.5747523303. The cubic root of 681448823 is about 879.9900235611.

It can be divided in two parts, 68144 and 8823, that added together give a palindrome (76967).

The spelling of 681448823 in words is "six hundred eighty-one million, four hundred forty-eight thousand, eight hundred twenty-three".