81457683 has 16 divisors (see below), whose sum is σ = 111818496. Its totient is φ = 52708320.

The previous prime is 81457681. The next prime is 81457699. The reversal of 81457683 is 38675418.

It is not a de Polignac number, because 81457683 - 2¹ = 81457681 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81457681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69460 + ... + 70622.

It is an arithmetic number, because the mean of its divisors is an integer number (6988656).

Almost surely, 2^81457683 is an apocalyptic number.

81457683 is a deficient number, since it is larger than the sum of its proper divisors (30360813).

81457683 is a wasteful number, since it uses less digits than its factorization.

81457683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1834.

The product of its digits is 161280, while the sum is 42.

The square root of 81457683 is about 9025.3910164602. The cubic root of 81457683 is about 433.4882707628.

The spelling of 81457683 in words is "eighty-one million, four hundred fifty-seven thousand, six hundred eighty-three".