81824824 has 16 divisors (see below), whose sum is σ = 155524320. Its totient is φ = 40351680.

The previous prime is 81824819. The next prime is 81824837. The reversal of 81824824 is 42842818.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69472 + ... + 70639.

It is an arithmetic number, because the mean of its divisors is an integer number (9720270).

Almost surely, 2^81824824 is an apocalyptic number.

It is an amenable number.

81824824 is a deficient number, since it is larger than the sum of its proper divisors (73699496).

81824824 is a wasteful number, since it uses less digits than its factorization.

81824824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140190 (or 140186 counting only the distinct ones).

The product of its digits is 32768, while the sum is 37.

The square root of 81824824 is about 9045.7074902962. The cubic root of 81824824 is about 434.1385585468.

The spelling of 81824824 in words is "eighty-one million, eight hundred twenty-four thousand, eight hundred twenty-four".