81053680 has 80 divisors (see below), whose sum is σ = 195924960. Its totient is φ = 31159296.

The previous prime is 81053653. The next prime is 81053681. The reversal of 81053680 is 8635018.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81053681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411342 + ... + 411538.

It is an arithmetic number, because the mean of its divisors is an integer number (2449062).

Almost surely, 2^81053680 is an apocalyptic number.

81053680 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81053680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97962480).

81053680 is an abundant number, since it is smaller than the sum of its proper divisors (114871280).

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

81053680 is a wasteful number, since it uses less digits than its factorization.

81053680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 380 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 81053680 is about 9002.9817282942. The cubic root of 81053680 is about 432.7704301796.

Adding to 81053680 its reverse (8635018), we get a palindrome (89688698).

The spelling of 81053680 in words is "eighty-one million, fifty-three thousand, six hundred eighty".