81930826 has 8 divisors (see below), whose sum is σ = 123171300. Its totient is φ = 40873728.

The previous prime is 81930817. The next prime is 81930847. The reversal of 81930826 is 62803918.

It can be written as a sum of positive squares in 2 ways, for example, as 77457601 + 4473225 = 8801^2 + 2115^2 .

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

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 44721 + ... + 46516.

Almost surely, 2^81930826 is an apocalyptic number.

81930826 is a deficient number, since it is larger than the sum of its proper divisors (41240474).

81930826 is a wasteful number, since it uses less digits than its factorization.

81930826 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91688.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 81930826 is about 9051.5648370876. The cubic root of 81930826 is about 434.3259495085.

The spelling of 81930826 in words is "eighty-one million, nine hundred thirty thousand, eight hundred twenty-six".