81053540 has 24 divisors (see below), whose sum is σ = 171028032. Its totient is φ = 32266080.

The previous prime is 81053537. The next prime is 81053549. The reversal of 81053540 is 4535018.

It is not an unprimeable number, because it can be changed into a prime (81053549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5384 + ... + 13823.

It is an arithmetic number, because the mean of its divisors is an integer number (7126168).

Almost surely, 2^81053540 is an apocalyptic number.

It is an amenable number.

81053540 is an abundant number, since it is smaller than the sum of its proper divisors (89974492).

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

81053540 is a wasteful number, since it uses less digits than its factorization.

81053540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19427 (or 19425 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 81053540 is about 9002.9739530891. The cubic root of 81053540 is about 432.7701810118.

Adding to 81053540 its reverse (4535018), we get a palindrome (85588558).

The spelling of 81053540 in words is "eighty-one million, fifty-three thousand, five hundred forty".