81340410 has 32 divisors (see below), whose sum is σ = 206701632. Its totient is φ = 20414720.

The previous prime is 81340367. The next prime is 81340411. The reversal of 81340410 is 1404318.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81340411) 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, 79236 + ... + 80255.

It is an arithmetic number, because the mean of its divisors is an integer number (6459426).

Almost surely, 2^81340410 is an apocalyptic number.

81340410 is an abundant number, since it is smaller than the sum of its proper divisors (125361222).

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

81340410 is a wasteful number, since it uses less digits than its factorization.

81340410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159518.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 81340410 is about 9018.8918388015. The cubic root of 81340410 is about 433.2801427152.

Adding to 81340410 its reverse (1404318), we get a palindrome (82744728).

The spelling of 81340410 in words is "eighty-one million, three hundred forty thousand, four hundred ten".