81330358 has 8 divisors (see below), whose sum is σ = 123714000. Its totient is φ = 40092360.

The previous prime is 81330343. The next prime is 81330377. The reversal of 81330358 is 85303318.

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

It is a super-2 number, since 2×81330358² = 13229254264816328, which contains 22 as substring.

It is a congruent number.

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, 286233 + ... + 286516.

It is an arithmetic number, because the mean of its divisors is an integer number (15464250).

Almost surely, 2^81330358 is an apocalyptic number.

81330358 is a deficient number, since it is larger than the sum of its proper divisors (42383642).

81330358 is a wasteful number, since it uses less digits than its factorization.

81330358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572822.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 81330358 is about 9018.3345469105. The cubic root of 81330358 is about 433.2622938115.

The spelling of 81330358 in words is "eighty-one million, three hundred thirty thousand, three hundred fifty-eight".