81089376 has 48 divisors (see below), whose sum is σ = 214326000. Its totient is φ = 26843648.

The previous prime is 81089347. The next prime is 81089377. The reversal of 81089376 is 67398018.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81089377) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11470 + ... + 17138.

It is an arithmetic number, because the mean of its divisors is an integer number (4465125).

Almost surely, 2^81089376 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 81089376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107163000).

81089376 is an abundant number, since it is smaller than the sum of its proper divisors (133236624).

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

81089376 is a wasteful number, since it uses less digits than its factorization.

81089376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5831 (or 5823 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 81089376 is about 9004.9639643921. The cubic root of 81089376 is about 432.8339514823.

The spelling of 81089376 in words is "eighty-one million, eighty-nine thousand, three hundred seventy-six".