81290793 has 8 divisors (see below), whose sum is σ = 109440448. Its totient is φ = 53667504.

The previous prime is 81290791. The next prime is 81290819. The reversal of 81290793 is 39709218.

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

It is not a de Polignac number, because 81290793 - 2¹ = 81290791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81290791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131230 + ... + 131847.

It is an arithmetic number, because the mean of its divisors is an integer number (13680056).

Almost surely, 2^81290793 is an apocalyptic number.

It is an amenable number.

81290793 is a deficient number, since it is larger than the sum of its proper divisors (28149655).

81290793 is a wasteful number, since it uses less digits than its factorization.

81290793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263183.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 81290793 is about 9016.1406932235. The cubic root of 81290793 is about 433.1920256545.

The spelling of 81290793 in words is "eighty-one million, two hundred ninety thousand, seven hundred ninety-three".