81411760 has 20 divisors (see below), whose sum is σ = 189282528. Its totient is φ = 32564672.

The previous prime is 81411739. The next prime is 81411769. The reversal of 81411760 is 6711418.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (81411769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 508744 + ... + 508903.

Almost surely, 2^81411760 is an apocalyptic number.

81411760 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81411760 is an abundant number, since it is smaller than the sum of its proper divisors (107870768).

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

81411760 is a wasteful number, since it uses less digits than its factorization.

81411760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017660 (or 1017654 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 81411760 is about 9022.8465574895. The cubic root of 81411760 is about 433.4067935947.

The spelling of 81411760 in words is "eighty-one million, four hundred eleven thousand, seven hundred sixty".