81290795 has 16 divisors (see below), whose sum is σ = 98872320. Its totient is φ = 64157184.

The previous prime is 81290791. The next prime is 81290819. The reversal of 81290795 is 59709218.

It is a cyclic number.

It is not a de Polignac number, because 81290795 - 2² = 81290791 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81290791) 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 15 ways as a sum of consecutive naturals, for example, 198551 + ... + 198959.

It is an arithmetic number, because the mean of its divisors is an integer number (6179520).

Almost surely, 2^81290795 is an apocalyptic number.

81290795 is a deficient number, since it is larger than the sum of its proper divisors (17581525).

81290795 is a wasteful number, since it uses less digits than its factorization.

81290795 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854.

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 81290795 is about 9016.1408041357. The cubic root of 81290795 is about 433.1920292071.

The spelling of 81290795 in words is "eighty-one million, two hundred ninety thousand, seven hundred ninety-five".