81536357 has 24 divisors (see below), whose sum is σ = 98849856. Its totient is φ = 65869056.

The previous prime is 81536347. The next prime is 81536359. The reversal of 81536357 is 75363518.

It is not a de Polignac number, because 81536357 - 2¹⁸ = 81274213 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81536357.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81536359) 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 23 ways as a sum of consecutive naturals, for example, 359078 + ... + 359304.

It is an arithmetic number, because the mean of its divisors is an integer number (4118744).

Almost surely, 2^81536357 is an apocalyptic number.

It is an amenable number.

81536357 is a deficient number, since it is larger than the sum of its proper divisors (17313499).

81536357 is a wasteful number, since it uses less digits than its factorization.

81536357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377 (or 354 counting only the distinct ones).

The product of its digits is 75600, while the sum is 38.

The square root of 81536357 is about 9029.7484461086. The cubic root of 81536357 is about 433.6277840301.

The spelling of 81536357 in words is "eighty-one million, five hundred thirty-six thousand, three hundred fifty-seven".