81411810 has 32 divisors (see below), whose sum is σ = 206883072. Its totient is φ = 20432640.

The previous prime is 81411779. The next prime is 81411821. The reversal of 81411810 is 1811418.

It is a super-2 number, since 2×81411810² = 13255765614952200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 79306 + ... + 80325.

It is an arithmetic number, because the mean of its divisors is an integer number (6465096).

Almost surely, 2^81411810 is an apocalyptic number.

81411810 is an abundant number, since it is smaller than the sum of its proper divisors (125471262).

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

81411810 is a wasteful number, since it uses less digits than its factorization.

81411810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159658.

The product of its (nonzero) digits is 256, while the sum is 24.

The square root of 81411810 is about 9022.8493282333. The cubic root of 81411810 is about 433.4068823220.

The spelling of 81411810 in words is "eighty-one million, four hundred eleven thousand, eight hundred ten".