83640917 has 4 divisors (see below), whose sum is σ = 83678400. Its totient is φ = 83603436.

The previous prime is 83640847. The next prime is 83640923. The reversal of 83640917 is 71904638.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 83640917 - 2¹⁴ = 83624533 is a prime.

It is a super-3 number, since 3×83640917³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83640517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15167 + ... + 19932.

It is an arithmetic number, because the mean of its divisors is an integer number (20919600).

Almost surely, 2^83640917 is an apocalyptic number.

It is an amenable number.

83640917 is a deficient number, since it is larger than the sum of its proper divisors (37483).

83640917 is a wasteful number, since it uses less digits than its factorization.

83640917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37482.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 83640917 is about 9145.5408259982. The cubic root of 83640917 is about 437.3269707060.

The spelling of 83640917 in words is "eighty-three million, six hundred forty thousand, nine hundred seventeen".