83640067 has 4 divisors (see below), whose sum is σ = 95588656. Its totient is φ = 71691480.

The previous prime is 83640047. The next prime is 83640103. The reversal of 83640067 is 76004638.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76004638 = 2 ⋅38002319.

It is not a de Polignac number, because 83640067 - 2¹⁵ = 83607299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83640047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5974284 + ... + 5974297.

It is an arithmetic number, because the mean of its divisors is an integer number (23897164).

Almost surely, 2^83640067 is an apocalyptic number.

83640067 is a deficient number, since it is larger than the sum of its proper divisors (11948589).

83640067 is a wasteful number, since it uses less digits than its factorization.

83640067 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11948588.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 83640067 is about 9145.4943551456. The cubic root of 83640067 is about 437.3254892573.

The spelling of 83640067 in words is "eighty-three million, six hundred forty thousand, sixty-seven".