78470247809 has 4 divisors (see below), whose sum is σ = 79088123904. Its totient is φ = 77852371716.

The previous prime is 78470247787. The next prime is 78470247829. The reversal of 78470247809 is 90874207487.

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 78470247809 - 2⁸ = 78470247553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78470247829) 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, 308937857 + ... + 308938110.

It is an arithmetic number, because the mean of its divisors is an integer number (19772030976).

Almost surely, 2^78470247809 is an apocalyptic number.

It is an amenable number.

78470247809 is a deficient number, since it is larger than the sum of its proper divisors (617876095).

78470247809 is a wasteful number, since it uses less digits than its factorization.

78470247809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617876094.

The product of its (nonzero) digits is 6322176, while the sum is 56.

The spelling of 78470247809 in words is "seventy-eight billion, four hundred seventy million, two hundred forty-seven thousand, eight hundred nine".