81828293 has 8 divisors (see below), whose sum is σ = 86959512. Its totient is φ = 76732416.

The previous prime is 81828277. The next prime is 81828301. The reversal of 81828293 is 39282818.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 702244 + 81126049 = 838^2 + 9007^2 .

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 81828293 - 2⁴ = 81828277 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 81828293.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81828223) 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, 3980 + ... + 13397.

It is an arithmetic number, because the mean of its divisors is an integer number (10869939).

Almost surely, 2^81828293 is an apocalyptic number.

It is an amenable number.

81828293 is a deficient number, since it is larger than the sum of its proper divisors (5131219).

81828293 is a wasteful number, since it uses less digits than its factorization.

81828293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17671.

The product of its digits is 55296, while the sum is 41.

The square root of 81828293 is about 9045.8992366707. The cubic root of 81828293 is about 434.1446936262.

The spelling of 81828293 in words is "eighty-one million, eight hundred twenty-eight thousand, two hundred ninety-three".