81330594 has 16 divisors (see below), whose sum is σ = 162749568. Its totient is φ = 27095472.

The previous prime is 81330559. The next prime is 81330637. The reversal of 81330594 is 49503318.

It is a super-2 number, since 2×81330594² = 13229331040785672, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19959 + ... + 23685.

It is an arithmetic number, because the mean of its divisors is an integer number (10171848).

Almost surely, 2^81330594 is an apocalyptic number.

81330594 is an abundant number, since it is smaller than the sum of its proper divisors (81418974).

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

81330594 is a wasteful number, since it uses less digits than its factorization.

81330594 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7369.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 81330594 is about 9018.3476313569. The cubic root of 81330594 is about 433.2627128834.

The spelling of 81330594 in words is "eighty-one million, three hundred thirty thousand, five hundred ninety-four".