81828319 has 8 divisors (see below), whose sum is σ = 86012640. Its totient is φ = 77696256.

The previous prime is 81828317. The next prime is 81828347. The reversal of 81828319 is 91382818.

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 81828319 - 2¹ = 81828317 is a prime.

It is a super-2 number, since 2×81828319² = 13391747580731522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81828311) 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, 9834 + ... + 16135.

It is an arithmetic number, because the mean of its divisors is an integer number (10751580).

Almost surely, 2^81828319 is an apocalyptic number.

81828319 is a deficient number, since it is larger than the sum of its proper divisors (4184321).

81828319 is a wasteful number, since it uses less digits than its factorization.

81828319 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26129.

The product of its digits is 27648, while the sum is 40.

The square root of 81828319 is about 9045.9006737859. The cubic root of 81828319 is about 434.1447396077.

The spelling of 81828319 in words is "eighty-one million, eight hundred twenty-eight thousand, three hundred nineteen".