81226016 has 12 divisors (see below), whose sum is σ = 159913782. Its totient is φ = 40612992.

The previous prime is 81226003. The next prime is 81226031. The reversal of 81226016 is 61062218.

It can be written as a sum of positive squares in only one way, i.e., 72250000 + 8976016 = 8500^2 + 2996^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1269125 + ... + 1269188.

Almost surely, 2^81226016 is an apocalyptic number.

It is an amenable number.

81226016 is a deficient number, since it is larger than the sum of its proper divisors (78687766).

81226016 is a wasteful number, since it uses less digits than its factorization.

81226016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2538323 (or 2538315 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 81226016 is about 9012.5476975159. The cubic root of 81226016 is about 433.0769312893.

The spelling of 81226016 in words is "eighty-one million, two hundred twenty-six thousand, sixteen".