81260357 has 16 divisors (see below), whose sum is σ = 91279872. Its totient is φ = 71934720.

The previous prime is 81260339. The next prime is 81260371. The reversal of 81260357 is 75306218.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 81260357 - 2¹⁸ = 80998213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81260057) 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 15 ways as a sum of consecutive naturals, for example, 22148 + ... + 25554.

It is an arithmetic number, because the mean of its divisors is an integer number (5704992).

Almost surely, 2^81260357 is an apocalyptic number.

It is an amenable number.

81260357 is a deficient number, since it is larger than the sum of its proper divisors (10019515).

81260357 is a wasteful number, since it uses less digits than its factorization.

81260357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3508.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 81260357 is about 9014.4526733463. The cubic root of 81260357 is about 433.1379552494.

The spelling of 81260357 in words is "eighty-one million, two hundred sixty thousand, three hundred fifty-seven".