81270336 has 112 divisors (see below), whose sum is σ = 260274816. Its totient is φ = 21848064.

The previous prime is 81270331. The next prime is 81270337. The reversal of 81270336 is 63307218.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (81270331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21070 + ... + 24626.

Almost surely, 2^81270336 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 81270336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130137408).

81270336 is an abundant number, since it is smaller than the sum of its proper divisors (179004480).

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

81270336 is a wasteful number, since it uses less digits than its factorization.

81270336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3596 (or 3586 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 81270336 is about 9015.0061564039. The cubic root of 81270336 is about 433.1556847094.

The spelling of 81270336 in words is "eighty-one million, two hundred seventy thousand, three hundred thirty-six".