81798095 has 8 divisors (see below), whose sum is σ = 100246464. Its totient is φ = 64045984.

The previous prime is 81798049. The next prime is 81798109. The reversal of 81798095 is 59089718.

81798095 = 160² + 161² + ... + 629².

It is a happy number.

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 81798095 - 2¹⁶ = 81732559 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 173804 + ... + 174273.

It is an arithmetic number, because the mean of its divisors is an integer number (12530808).

Almost surely, 2^81798095 is an apocalyptic number.

81798095 is a deficient number, since it is larger than the sum of its proper divisors (18448369).

81798095 is a wasteful number, since it uses less digits than its factorization.

81798095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 348129.

The product of its (nonzero) digits is 181440, while the sum is 47.

The square root of 81798095 is about 9044.2299285235. The cubic root of 81798095 is about 434.0912813159.

The spelling of 81798095 in words is "eighty-one million, seven hundred ninety-eight thousand, ninety-five".