81326588 has 24 divisors (see below), whose sum is σ = 166438272. Its totient is φ = 34043184.

The previous prime is 81326587. The next prime is 81326621. The reversal of 81326588 is 88562318.

It is a super-2 number, since 2×81326588² = 13228027831443488, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81326587) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32570 + ... + 34977.

It is an arithmetic number, because the mean of its divisors is an integer number (6934928).

Almost surely, 2^81326588 is an apocalyptic number.

It is an amenable number.

81326588 is an abundant number, since it is smaller than the sum of its proper divisors (85111684).

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

81326588 is a wasteful number, since it uses less digits than its factorization.

81326588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67601 (or 67599 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 81326588 is about 9018.1255258507. The cubic root of 81326588 is about 433.2555992056.

The spelling of 81326588 in words is "eighty-one million, three hundred twenty-six thousand, five hundred eighty-eight".