81246336 has 64 divisors (see below), whose sum is σ = 217235520. Its totient is φ = 26903552.

The previous prime is 81246329. The next prime is 81246353. The reversal of 81246336 is 63364218.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×81246336² = 13201934226849792, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 81246297 and 81246306.

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, 65821 + ... + 67043.

It is an arithmetic number, because the mean of its divisors is an integer number (3394305).

Almost surely, 2^81246336 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 81246336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108617760).

81246336 is an abundant number, since it is smaller than the sum of its proper divisors (135989184).

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

81246336 is a wasteful number, since it uses less digits than its factorization.

81246336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1413 (or 1401 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 81246336 is about 9013.6749442167. The cubic root of 81246336 is about 433.1130420083.

The spelling of 81246336 in words is "eighty-one million, two hundred forty-six thousand, three hundred thirty-six".