81154080 has 288 divisors, whose sum is σ = 323616384. Its totient is φ = 18137088.

The previous prime is 81154049. The next prime is 81154081. The reversal of 81154080 is 8045118.

It is a tau number, because it is divible by the number of its divisors (288).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81154081) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 836592 + ... + 836688.

It is an arithmetic number, because the mean of its divisors is an integer number (1123668).

Almost surely, 2^81154080 is an apocalyptic number.

81154080 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81154080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161808192).

81154080 is an abundant number, since it is smaller than the sum of its proper divisors (242462304).

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

81154080 is a wasteful number, since it uses less digits than its factorization.

81154080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 81154080 is about 9008.5559331116. Note that the first 3 decimals coincide. The cubic root of 81154080 is about 432.9490452372.

Adding to 81154080 its reverse (8045118), we get a palindrome (89199198).

The spelling of 81154080 in words is "eighty-one million, one hundred fifty-four thousand, eighty".