81826305 has 32 divisors (see below), whose sum is σ = 143233920. Its totient is φ = 39559680.

The previous prime is 81826301. The next prime is 81826319. The reversal of 81826305 is 50362818.

It is a happy number.

It is not a de Polignac number, because 81826305 - 2² = 81826301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81826301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100741 + ... + 101549.

It is an arithmetic number, because the mean of its divisors is an integer number (4476060).

Almost surely, 2^81826305 is an apocalyptic number.

It is an amenable number.

81826305 is a deficient number, since it is larger than the sum of its proper divisors (61407615).

81826305 is a wasteful number, since it uses less digits than its factorization.

81826305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 81826305 is about 9045.7893519582. The cubic root of 81826305 is about 434.1411777818.

The spelling of 81826305 in words is "eighty-one million, eight hundred twenty-six thousand, three hundred five".