81466788 has 108 divisors (see below), whose sum is σ = 220229520. Its totient is φ = 23422464.

The previous prime is 81466783. The next prime is 81466799. The reversal of 81466788 is 88766418.

It is not an unprimeable number, because it can be changed into a prime (81466783) 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 35 ways as a sum of consecutive naturals, for example, 586023 + ... + 586161.

Almost surely, 2^81466788 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81466788, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110114760).

81466788 is an abundant number, since it is smaller than the sum of its proper divisors (138762732).

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

81466788 is a wasteful number, since it uses less digits than its factorization.

81466788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206 (or 174 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The square root of 81466788 is about 9025.8954126447. The cubic root of 81466788 is about 433.5044213313.

The spelling of 81466788 in words is "eighty-one million, four hundred sixty-six thousand, seven hundred eighty-eight".