86781824 has 16 divisors (see below), whose sum is σ = 172885920. Its totient is φ = 43390848.

The previous prime is 86781823. The next prime is 86781841. The reversal of 86781824 is 42818768.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86781823) 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, 338864 + ... + 339119.

It is an arithmetic number, because the mean of its divisors is an integer number (10805370).

Almost surely, 2^86781824 is an apocalyptic number.

It is an amenable number.

86781824 is a deficient number, since it is larger than the sum of its proper divisors (86104096).

86781824 is an equidigital number, since it uses as much as digits as its factorization.

86781824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677997 (or 677985 counting only the distinct ones).

The product of its digits is 172032, while the sum is 44.

The square root of 86781824 is about 9315.6762502783. The cubic root of 86781824 is about 442.7340504831.

The spelling of 86781824 in words is "eighty-six million, seven hundred eighty-one thousand, eight hundred twenty-four".