78339044509 has 16 divisors (see below), whose sum is σ = 85618377216. Its totient is φ = 71086118400.

The previous prime is 78339044477. The next prime is 78339044561. The reversal of 78339044509 is 90544093387.

It is not a de Polignac number, because 78339044509 - 2⁵ = 78339044477 is a prime.

It is a super-2 number, since 2×78339044509² (a number of 23 digits) contains 22 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 (78339044809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18060789 + ... + 18065125.

It is an arithmetic number, because the mean of its divisors is an integer number (5351148576).

Almost surely, 2^78339044509 is an apocalyptic number.

It is an amenable number.

78339044509 is a deficient number, since it is larger than the sum of its proper divisors (7279332707).

78339044509 is a wasteful number, since it uses less digits than its factorization.

78339044509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6996.

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 78339044509 in words is "seventy-eight billion, three hundred thirty-nine million, forty-four thousand, five hundred nine".