81201276 has 144 divisors (see below), whose sum is σ = 237269760. Its totient is φ = 23224320.

The previous prime is 81201271. The next prime is 81201283. The reversal of 81201276 is 67210218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81201271) 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 47 ways as a sum of consecutive naturals, for example, 420636 + ... + 420828.

Almost surely, 2^81201276 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 81201276, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118634880).

81201276 is an abundant number, since it is smaller than the sum of its proper divisors (156068484).

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

81201276 is a wasteful number, since it uses less digits than its factorization.

81201276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276 (or 271 counting only the distinct ones).

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

The square root of 81201276 is about 9011.1750621104. The cubic root of 81201276 is about 433.0329576473.

The spelling of 81201276 in words is "eighty-one million, two hundred one thousand, two hundred seventy-six".