81481410 has 64 divisors (see below), whose sum is σ = 226748160. Its totient is φ = 20782080.

The previous prime is 81481399. The next prime is 81481417. The reversal of 81481410 is 1418418.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (81481417) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 351 + ... + 12770.

It is an arithmetic number, because the mean of its divisors is an integer number (3542940).

Almost surely, 2^81481410 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81481410, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113374080).

81481410 is an abundant number, since it is smaller than the sum of its proper divisors (145266750).

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

81481410 is a wasteful number, since it uses less digits than its factorization.

81481410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13160 (or 13154 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 81481410 is about 9026.7053790406. The cubic root of 81481410 is about 433.5303555089.

Adding to 81481410 its reverse (1418418), we get a palindrome (82899828).

The spelling of 81481410 in words is "eighty-one million, four hundred eighty-one thousand, four hundred ten".