81680295 has 8 divisors (see below), whose sum is σ = 130688496. Its totient is φ = 43562816.

The previous prime is 81680293. The next prime is 81680299. The reversal of 81680295 is 59208618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81680295 - 2¹ = 81680293 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81680293) 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 7 ways as a sum of consecutive naturals, for example, 2722662 + ... + 2722691.

It is an arithmetic number, because the mean of its divisors is an integer number (16336062).

Almost surely, 2^81680295 is an apocalyptic number.

81680295 is a deficient number, since it is larger than the sum of its proper divisors (49008201).

81680295 is a wasteful number, since it uses less digits than its factorization.

81680295 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5445361.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 81680295 is about 9037.7151426674. The cubic root of 81680295 is about 433.8827983837.

The spelling of 81680295 in words is "eighty-one million, six hundred eighty thousand, two hundred ninety-five".