78424680709 has 4 divisors (see below), whose sum is σ = 78425627616. Its totient is φ = 78423733804.

The previous prime is 78424680703. The next prime is 78424680751. The reversal of 78424680709 is 90708642487.

It is a happy number.

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 78424680709 - 2³³ = 69834746117 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78424680709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78424680703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 335899 + ... + 519304.

It is an arithmetic number, because the mean of its divisors is an integer number (19606406904).

Almost surely, 2^78424680709 is an apocalyptic number.

It is an amenable number.

78424680709 is a deficient number, since it is larger than the sum of its proper divisors (946907).

78424680709 is an equidigital number, since it uses as much as digits as its factorization.

78424680709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 946906.

The product of its (nonzero) digits is 5419008, while the sum is 55.

The spelling of 78424680709 in words is "seventy-eight billion, four hundred twenty-four million, six hundred eighty thousand, seven hundred nine".