81326586 has 16 divisors (see below), whose sum is σ = 177439968. Its totient is φ = 24644400.

The previous prime is 81326573. The next prime is 81326587. The reversal of 81326586 is 68562318.

It is a happy number.

It is a super-2 number, since 2×81326586² = 13228027180830792, which contains 22 as substring.

It is a Curzon 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, 616045 + ... + 616176.

It is an arithmetic number, because the mean of its divisors is an integer number (11089998).

Almost surely, 2^81326586 is an apocalyptic number.

81326586 is an abundant number, since it is smaller than the sum of its proper divisors (96113382).

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

81326586 is a wasteful number, since it uses less digits than its factorization.

81326586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1232237.

The product of its digits is 69120, while the sum is 39.

The square root of 81326586 is about 9018.1254149629. The cubic root of 81326586 is about 433.2555956541.

The spelling of 81326586 in words is "eighty-one million, three hundred twenty-six thousand, five hundred eighty-six".