81054880 has 24 divisors (see below), whose sum is σ = 191492532. Its totient is φ = 32421888.

The previous prime is 81054859. The next prime is 81054887. The reversal of 81054880 is 8845018.

It can be written as a sum of positive squares in 2 ways, for example, as 77228944 + 3825936 = 8788^2 + 1956^2 .

It is not an unprimeable number, because it can be changed into a prime (81054887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 253137 + ... + 253456.

Almost surely, 2^81054880 is an apocalyptic number.

81054880 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81054880 is an abundant number, since it is smaller than the sum of its proper divisors (110437652).

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

81054880 is a wasteful number, since it uses less digits than its factorization.

81054880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 506608 (or 506600 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 34.

The square root of 81054880 is about 9003.0483726347. The cubic root of 81054880 is about 432.7725658916.

Adding to 81054880 its reverse (8845018), we get a palindrome (89899898).

The spelling of 81054880 in words is "eighty-one million, fifty-four thousand, eight hundred eighty".