81026712 has 72 divisors (see below), whose sum is σ = 237662100. Its totient is φ = 24927552.

The previous prime is 81026689. The next prime is 81026717. The reversal of 81026712 is 21762018.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81026717) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 8839 + ... + 15497.

Almost surely, 2^81026712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81026712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118831050).

81026712 is an abundant number, since it is smaller than the sum of its proper divisors (156635388).

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

81026712 is a wasteful number, since it uses less digits than its factorization.

81026712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6697 (or 6677 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 81026712 is about 9001.4838776726. The cubic root of 81026712 is about 432.7224280507.

The spelling of 81026712 in words is "eighty-one million, twenty-six thousand, seven hundred twelve".