81104320 has 56 divisors (see below), whose sum is σ = 210696048. Its totient is φ = 29491200.

The previous prime is 81104249. The next prime is 81104377. The reversal of 81104320 is 2340118.

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8001 + ... + 15040.

Almost surely, 2^81104320 is an apocalyptic number.

81104320 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81104320 is an abundant number, since it is smaller than the sum of its proper divisors (129591728).

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

81104320 is a wasteful number, since it uses less digits than its factorization.

81104320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23069 (or 23059 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 81104320 is about 9005.7936907304. The cubic root of 81104320 is about 432.8605389080.

Adding to 81104320 its reverse (2340118), we get a palindrome (83444438).

It can be divided in two parts, 81 and 104320, that added together give a palindrome (104401).

The spelling of 81104320 in words is "eighty-one million, one hundred four thousand, three hundred twenty".