81545260 has 48 divisors (see below), whose sum is σ = 182087136. Its totient is φ = 30569472.

The previous prime is 81545251. The next prime is 81545267. The reversal of 81545260 is 6254518.

It is not an unprimeable number, because it can be changed into a prime (81545267) 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 15 ways as a sum of consecutive naturals, for example, 126499 + ... + 127141.

It is an arithmetic number, because the mean of its divisors is an integer number (3793482).

Almost surely, 2^81545260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81545260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91043568).

81545260 is an abundant number, since it is smaller than the sum of its proper divisors (100541876).

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

81545260 is a wasteful number, since it uses less digits than its factorization.

81545260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1042 (or 1040 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 81545260 is about 9030.2414142702. The cubic root of 81545260 is about 433.6435661417.

Adding to 81545260 its reverse (6254518), we get a palindrome (87799778).

The spelling of 81545260 in words is "eighty-one million, five hundred forty-five thousand, two hundred sixty".