81826413 has 8 divisors (see below), whose sum is σ = 109169376. Its totient is φ = 54517200.

The previous prime is 81826411. The next prime is 81826427. The reversal of 81826413 is 31462818.

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

It is not a de Polignac number, because 81826413 - 2¹ = 81826411 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81826411) 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, 2098 + ... + 12963.

It is an arithmetic number, because the mean of its divisors is an integer number (13646172).

Almost surely, 2^81826413 is an apocalyptic number.

It is an amenable number.

81826413 is a deficient number, since it is larger than the sum of its proper divisors (27342963).

81826413 is a wasteful number, since it uses less digits than its factorization.

81826413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16875.

The product of its digits is 9216, while the sum is 33.

The square root of 81826413 is about 9045.7953215845. The cubic root of 81826413 is about 434.1413687849.

The spelling of 81826413 in words is "eighty-one million, eight hundred twenty-six thousand, four hundred thirteen".