81776112 has 80 divisors (see below), whose sum is σ = 234330240. Its totient is φ = 24364800.

The previous prime is 81776087. The next prime is 81776159. The reversal of 81776112 is 21167718.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30939 + ... + 33477.

It is an arithmetic number, because the mean of its divisors is an integer number (2929128).

Almost surely, 2^81776112 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 81776112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (117165120).

81776112 is an abundant number, since it is smaller than the sum of its proper divisors (152554128).

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

81776112 is a wasteful number, since it uses less digits than its factorization.

81776112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2622 (or 2616 counting only the distinct ones).

The product of its digits is 4704, while the sum is 33.

The square root of 81776112 is about 9043.0145416227. The cubic root of 81776112 is about 434.0523909089.

The spelling of 81776112 in words is "eighty-one million, seven hundred seventy-six thousand, one hundred twelve".