81467776 has 64 divisors (see below), whose sum is σ = 176415120. Its totient is φ = 37251072.

The previous prime is 81467773. The next prime is 81467797. The reversal of 81467776 is 67776418.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81467773) 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 7 ways as a sum of consecutive naturals, for example, 287731 + ... + 288013.

Almost surely, 2^81467776 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 81467776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88207560).

81467776 is an abundant number, since it is smaller than the sum of its proper divisors (94947344).

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

81467776 is a wasteful number, since it uses less digits than its factorization.

81467776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 471 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The square root of 81467776 is about 9025.9501438907. The cubic root of 81467776 is about 433.5061737863.

The spelling of 81467776 in words is "eighty-one million, four hundred sixty-seven thousand, seven hundred seventy-six".