81924355 has 16 divisors (see below), whose sum is σ = 101352384. Its totient is φ = 63531520.

The previous prime is 81924341. The next prime is 81924361. The reversal of 81924355 is 55342918.

It is not a de Polignac number, because 81924355 - 2⁹ = 81923843 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33039 + ... + 35431.

It is an arithmetic number, because the mean of its divisors is an integer number (6334524).

Almost surely, 2^81924355 is an apocalyptic number.

81924355 is a deficient number, since it is larger than the sum of its proper divisors (19428029).

81924355 is a wasteful number, since it uses less digits than its factorization.

81924355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2606.

The product of its digits is 43200, while the sum is 37.

The square root of 81924355 is about 9051.2073780242. The cubic root of 81924355 is about 434.3145146703.

The spelling of 81924355 in words is "eighty-one million, nine hundred twenty-four thousand, three hundred fifty-five".