81357360 has 160 divisors (see below), whose sum is σ = 292362240. Its totient is φ = 18330624.

The previous prime is 81357319. The next prime is 81357379. The reversal of 81357360 is 6375318.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132414 + ... + 133026.

It is an arithmetic number, because the mean of its divisors is an integer number (1827264).

Almost surely, 2^81357360 is an apocalyptic number.

81357360 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 81357360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146181120).

81357360 is an abundant number, since it is smaller than the sum of its proper divisors (211004880).

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

81357360 is a wasteful number, since it uses less digits than its factorization.

81357360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715 (or 709 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 81357360 is about 9019.8314840134. The cubic root of 81357360 is about 433.3102367703.

The spelling of 81357360 in words is "eighty-one million, three hundred fifty-seven thousand, three hundred sixty".