81930363 has 8 divisors (see below), whose sum is σ = 109358928. Its totient is φ = 54561024.

The previous prime is 81930323. The next prime is 81930391. The reversal of 81930363 is 36303918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81930363 - 2¹⁰ = 81929339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81930323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11470 + ... + 17187.

It is an arithmetic number, because the mean of its divisors is an integer number (13669866).

Almost surely, 2^81930363 is an apocalyptic number.

81930363 is a deficient number, since it is larger than the sum of its proper divisors (27428565).

81930363 is a wasteful number, since it uses less digits than its factorization.

81930363 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29613.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 81930363 is about 9051.5392613632. The cubic root of 81930363 is about 434.3251313659.

The spelling of 81930363 in words is "eighty-one million, nine hundred thirty thousand, three hundred sixty-three".