81227286 has 80 divisors (see below), whose sum is σ = 210760704. Its totient is φ = 22901616.

The previous prime is 81227269. The next prime is 81227303. The reversal of 81227286 is 68272218.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81227269) and next prime (81227303).

It is a self number, because there is not a number n which added to its sum of digits gives 81227286.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 93691 + ... + 94553.

Almost surely, 2^81227286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81227286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105380352).

81227286 is an abundant number, since it is smaller than the sum of its proper divisors (129533418).

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

81227286 is a wasteful number, since it uses less digits than its factorization.

81227286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 967 (or 958 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 81227286 is about 9012.6181545653. The cubic root of 81227286 is about 433.0791883857.

The spelling of 81227286 in words is "eighty-one million, two hundred twenty-seven thousand, two hundred eighty-six".