81084824 has 8 divisors (see below), whose sum is σ = 152034060. Its totient is φ = 40542408.

The previous prime is 81084811. The next prime is 81084827. The reversal of 81084824 is 42848018.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×81084824² = 13149497366221952, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81084827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5067794 + ... + 5067809.

Almost surely, 2^81084824 is an apocalyptic number.

It is an amenable number.

81084824 is a deficient number, since it is larger than the sum of its proper divisors (70949236).

81084824 is a wasteful number, since it uses less digits than its factorization.

81084824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10135609 (or 10135605 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 35.

The square root of 81084824 is about 9004.7112113604. The cubic root of 81084824 is about 432.8258522010.

The spelling of 81084824 in words is "eighty-one million, eighty-four thousand, eight hundred twenty-four".