81824744 has 16 divisors (see below), whose sum is σ = 156686400. Its totient is φ = 40041712.

The previous prime is 81824741. The next prime is 81824753. The reversal of 81824744 is 44742818.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81824698 and 81824707.

It is not an unprimeable number, because it can be changed into a prime (81824741) 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, 108434 + ... + 109185.

It is an arithmetic number, because the mean of its divisors is an integer number (9792900).

Almost surely, 2^81824744 is an apocalyptic number.

It is an amenable number.

81824744 is a deficient number, since it is larger than the sum of its proper divisors (74861656).

81824744 is a wasteful number, since it uses less digits than its factorization.

81824744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217672 (or 217668 counting only the distinct ones).

The product of its digits is 57344, while the sum is 38.

The square root of 81824744 is about 9045.7030683082. The cubic root of 81824744 is about 434.1384170612.

The spelling of 81824744 in words is "eighty-one million, eight hundred twenty-four thousand, seven hundred forty-four".