81326358 has 24 divisors (see below), whose sum is σ = 176373288. Its totient is φ = 27083232.

The previous prime is 81326347. The next prime is 81326381. The reversal of 81326358 is 85362318.

81326358 is a `hidden beast` number, since 8 + 13 + 2 + 635 + 8 = 666.

It is a super-2 number, since 2×81326358² = 13227953011088328, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 34741 + ... + 37007.

It is an arithmetic number, because the mean of its divisors is an integer number (7348887).

Almost surely, 2^81326358 is an apocalyptic number.

81326358 is an abundant number, since it is smaller than the sum of its proper divisors (95046930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81326358 is a wasteful number, since it uses less digits than its factorization.

81326358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4268 (or 4265 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 81326358 is about 9018.1127737460. The cubic root of 81326358 is about 433.2551907747.

The spelling of 81326358 in words is "eighty-one million, three hundred twenty-six thousand, three hundred fifty-eight".