83640091 has 8 divisors (see below), whose sum is σ = 86126240. Its totient is φ = 81165888.

The previous prime is 83640047. The next prime is 83640103. The reversal of 83640091 is 19004638.

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 83640091 - 2²¹ = 81542939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (83640191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12370 + ... + 17896.

It is an arithmetic number, because the mean of its divisors is an integer number (10765780).

Almost surely, 2^83640091 is an apocalyptic number.

83640091 is a deficient number, since it is larger than the sum of its proper divisors (2486149).

83640091 is a wasteful number, since it uses less digits than its factorization.

83640091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5973.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 83640091 is about 9145.4956672670. The cubic root of 83640091 is about 437.3255310865.

The spelling of 83640091 in words is "eighty-three million, six hundred forty thousand, ninety-one".