81054580 has 24 divisors (see below), whose sum is σ = 171780840. Its totient is φ = 32123520.

The previous prime is 81054557. The next prime is 81054583. The reversal of 81054580 is 8545018.

It can be written as a sum of positive squares in 4 ways, for example, as 8225424 + 72829156 = 2868^2 + 8534^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81054583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16411 + ... + 20770.

It is an arithmetic number, because the mean of its divisors is an integer number (7157535).

Almost surely, 2^81054580 is an apocalyptic number.

It is an amenable number.

81054580 is an abundant number, since it is smaller than the sum of its proper divisors (90726260).

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

81054580 is a wasteful number, since it uses less digits than its factorization.

81054580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37299 (or 37297 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 81054580 is about 9003.0317115958. The cubic root of 81054580 is about 432.7720319655.

Adding to 81054580 its reverse (8545018), we get a palindrome (89599598).

The spelling of 81054580 in words is "eighty-one million, fifty-four thousand, five hundred eighty".