81226588 has 6 divisors (see below), whose sum is σ = 142146536. Its totient is φ = 40613292.

The previous prime is 81226571. The next prime is 81226591. The reversal of 81226588 is 88562218.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81226588.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10153320 + ... + 10153327.

Almost surely, 2^81226588 is an apocalyptic number.

It is an amenable number.

81226588 is a deficient number, since it is larger than the sum of its proper divisors (60919948).

81226588 is a wasteful number, since it uses less digits than its factorization.

81226588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20306651 (or 20306649 counting only the distinct ones).

The product of its digits is 61440, while the sum is 40.

The square root of 81226588 is about 9012.5794309953. The cubic root of 81226588 is about 433.0779478742.

The spelling of 81226588 in words is "eighty-one million, two hundred twenty-six thousand, five hundred eighty-eight".