81227910 has 32 divisors (see below), whose sum is σ = 195971040. Its totient is φ = 21547008.

The previous prime is 81227863. The next prime is 81227917. The reversal of 81227910 is 1972218.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81227917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1225 + ... + 12804.

It is an arithmetic number, because the mean of its divisors is an integer number (6124095).

Almost surely, 2^81227910 is an apocalyptic number.

81227910 is an abundant number, since it is smaller than the sum of its proper divisors (114743130).

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

81227910 is a wasteful number, since it uses less digits than its factorization.

81227910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14232.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 81227910 is about 9012.6527726303. The cubic root of 81227910 is about 433.0802973756.

The spelling of 81227910 in words is "eighty-one million, two hundred twenty-seven thousand, nine hundred ten".