81675693 has 12 divisors (see below), whose sum is σ = 128701248. Its totient is φ = 49500360.

The previous prime is 81675689. The next prime is 81675697. The reversal of 81675693 is 39657618.

It is a happy number.

81675693 is a `hidden beast` number, since 81 + 6 + 7 + 569 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (81675689) and next prime (81675697).

It is not a de Polignac number, because 81675693 - 2² = 81675689 is a prime.

It is a super-3 number, since 3×81675693³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81675697) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 412405 + ... + 412602.

It is an arithmetic number, because the mean of its divisors is an integer number (10725104).

Almost surely, 2^81675693 is an apocalyptic number.

It is an amenable number.

81675693 is a deficient number, since it is larger than the sum of its proper divisors (47025555).

81675693 is a wasteful number, since it uses less digits than its factorization.

81675693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825024 (or 825021 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 81675693 is about 9037.4605393329. The cubic root of 81675693 is about 433.8746496776.

The spelling of 81675693 in words is "eighty-one million, six hundred seventy-five thousand, six hundred ninety-three".