81260512 has 24 divisors (see below), whose sum is σ = 161141400. Its totient is φ = 40335744.

The previous prime is 81260507. The next prime is 81260519. The reversal of 81260512 is 21506218.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81260519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4687 + ... + 13582.

It is an arithmetic number, because the mean of its divisors is an integer number (6714225).

Almost surely, 2^81260512 is an apocalyptic number.

It is an amenable number.

81260512 is a deficient number, since it is larger than the sum of its proper divisors (79880888).

81260512 is a wasteful number, since it uses less digits than its factorization.

81260512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18418 (or 18410 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 81260512 is about 9014.4612706473. The cubic root of 81260512 is about 433.1382306454.

The spelling of 81260512 in words is "eighty-one million, two hundred sixty thousand, five hundred twelve".