83640849 has 4 divisors (see below), whose sum is σ = 111521136. Its totient is φ = 55760564.

The previous prime is 83640847. The next prime is 83640923. The reversal of 83640849 is 94804638.

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 83640849 - 2¹ = 83640847 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 83640849.

It is not an unprimeable number, because it can be changed into a prime (83640847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13940139 + ... + 13940144.

It is an arithmetic number, because the mean of its divisors is an integer number (27880284).

Almost surely, 2^83640849 is an apocalyptic number.

It is an amenable number.

83640849 is a deficient number, since it is larger than the sum of its proper divisors (27880287).

83640849 is a wasteful number, since it uses less digits than its factorization.

83640849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27880286.

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 83640849 is about 9145.5371083387. The cubic root of 83640849 is about 437.3268521904.

The spelling of 83640849 in words is "eighty-three million, six hundred forty thousand, eight hundred forty-nine".