81441396 has 48 divisors (see below), whose sum is σ = 218433600. Its totient is φ = 26210016.

The previous prime is 81441383. The next prime is 81441419. The reversal of 81441396 is 69314418.

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

It is a self number, because there is not a number n which added to its sum of digits gives 81441396.

It is a congruent number.

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, 9870 + ... + 16133.

It is an arithmetic number, because the mean of its divisors is an integer number (4550700).

Almost surely, 2^81441396 is an apocalyptic number.

It is an amenable number.

81441396 is an abundant number, since it is smaller than the sum of its proper divisors (136992204).

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

81441396 is a wasteful number, since it uses less digits than its factorization.

81441396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26045 (or 26037 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 81441396 is about 9024.4886835765. The cubic root of 81441396 is about 433.4593776664.

The spelling of 81441396 in words is "eighty-one million, four hundred forty-one thousand, three hundred ninety-six".