81226284 has 24 divisors (see below), whose sum is σ = 190580208. Its totient is φ = 26925120.

The previous prime is 81226261. The next prime is 81226291. The reversal of 81226284 is 48262218.

It is a happy number.

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, 16527 + ... + 20870.

It is an arithmetic number, because the mean of its divisors is an integer number (7940842).

Almost surely, 2^81226284 is an apocalyptic number.

It is an amenable number.

81226284 is an abundant number, since it is smaller than the sum of its proper divisors (109353924).

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

81226284 is a wasteful number, since it uses less digits than its factorization.

81226284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37585 (or 37583 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 81226284 is about 9012.5625656636. The cubic root of 81226284 is about 433.0774075919.

The spelling of 81226284 in words is "eighty-one million, two hundred twenty-six thousand, two hundred eighty-four".