83820805 has 8 divisors (see below), whose sum is σ = 101062944. Its totient is φ = 66738000.

The previous prime is 83820773. The next prime is 83820811. The reversal of 83820805 is 50802838.

It is a happy number.

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

It is not a de Polignac number, because 83820805 - 2⁵ = 83820773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38671 + ... + 40780.

It is an arithmetic number, because the mean of its divisors is an integer number (12632868).

Almost surely, 2^83820805 is an apocalyptic number.

It is an amenable number.

83820805 is a deficient number, since it is larger than the sum of its proper divisors (17242139).

83820805 is a wasteful number, since it uses less digits than its factorization.

83820805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79667.

The product of its (nonzero) digits is 15360, while the sum is 34.

The square root of 83820805 is about 9155.3702819711. The cubic root of 83820805 is about 437.6402684926.

The spelling of 83820805 in words is "eighty-three million, eight hundred twenty thousand, eight hundred five".