81088560 has 320 divisors, whose sum is σ = 331407360. Its totient is φ = 17832960.

The previous prime is 81088541. The next prime is 81088573. The reversal of 81088560 is 6588018.

81088560 is a `hidden beast` number, since 8 + 10 + 88 + 560 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 468634 + ... + 468806.

It is an arithmetic number, because the mean of its divisors is an integer number (1035648).

Almost surely, 2^81088560 is an apocalyptic number.

81088560 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 81088560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165703680).

81088560 is an abundant number, since it is smaller than the sum of its proper divisors (250318800).

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

81088560 is a wasteful number, since it uses less digits than its factorization.

81088560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 36.

The square root of 81088560 is about 9004.9186559347. The cubic root of 81088560 is about 432.8324996124.

The spelling of 81088560 in words is "eighty-one million, eighty-eight thousand, five hundred sixty".