83640811 has 8 divisors (see below), whose sum is σ = 87426720. Its totient is φ = 79867392.

The previous prime is 83640773. The next prime is 83640839. The reversal of 83640811 is 11804638.

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 83640811 - 2²¹ = 81543659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83640311) 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, 12235 + ... + 17803.

It is an arithmetic number, because the mean of its divisors is an integer number (10928340).

Almost surely, 2^83640811 is an apocalyptic number.

83640811 is a deficient number, since it is larger than the sum of its proper divisors (3785909).

83640811 is a wasteful number, since it uses less digits than its factorization.

83640811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6245.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 83640811 is about 9145.5350308224. The cubic root of 83640811 is about 437.3267859611.

The spelling of 83640811 in words is "eighty-three million, six hundred forty thousand, eight hundred eleven".