81227768 has 16 divisors (see below), whose sum is σ = 161261280. Its totient is φ = 38224768.

The previous prime is 81227767. The next prime is 81227777. The reversal of 81227768 is 86772218.

It is a super-3 number, since 3×81227768³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81227767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 298496 + ... + 298767.

It is an arithmetic number, because the mean of its divisors is an integer number (10078830).

Almost surely, 2^81227768 is an apocalyptic number.

It is an amenable number.

81227768 is a deficient number, since it is larger than the sum of its proper divisors (80033512).

81227768 is a wasteful number, since it uses less digits than its factorization.

81227768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597286 (or 597282 counting only the distinct ones).

The product of its digits is 75264, while the sum is 41.

The square root of 81227768 is about 9012.6448948131. The cubic root of 81227768 is about 433.0800450098.

The spelling of 81227768 in words is "eighty-one million, two hundred twenty-seven thousand, seven hundred sixty-eight".