83644079 has 4 divisors (see below), whose sum is σ = 83709384. Its totient is φ = 83578776.

The previous prime is 83644049. The next prime is 83644081. The reversal of 83644079 is 97044638.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-83644079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83644009) 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 3 ways as a sum of consecutive naturals, for example, 30692 + ... + 33305.

It is an arithmetic number, because the mean of its divisors is an integer number (20927346).

Almost surely, 2^83644079 is an apocalyptic number.

83644079 is a deficient number, since it is larger than the sum of its proper divisors (65305).

83644079 is a wasteful number, since it uses less digits than its factorization.

83644079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65304.

The product of its (nonzero) digits is 145152, while the sum is 41.

The square root of 83644079 is about 9145.7136954969. The cubic root of 83644079 is about 437.3324816070.

The spelling of 83644079 in words is "eighty-three million, six hundred forty-four thousand, seventy-nine".