81366050 has 24 divisors (see below), whose sum is σ = 153264000. Its totient is φ = 32132880.

The previous prime is 81366011. The next prime is 81366053. The reversal of 81366050 is 5066318.

It is not an unprimeable number, because it can be changed into a prime (81366053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6350 + ... + 14249.

It is an arithmetic number, because the mean of its divisors is an integer number (6386000).

Almost surely, 2^81366050 is an apocalyptic number.

81366050 is a deficient number, since it is larger than the sum of its proper divisors (71897950).

81366050 is a wasteful number, since it uses less digits than its factorization.

81366050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20690 (or 20685 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 81366050 is about 9020.3131874675. The cubic root of 81366050 is about 433.3256639011.

The spelling of 81366050 in words is "eighty-one million, three hundred sixty-six thousand, fifty".