78079789 has 4 divisors (see below), whose sum is σ = 78957180. Its totient is φ = 77202400.

The previous prime is 78079783. The next prime is 78079819. The reversal of 78079789 is 98797087.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12744900 + 65334889 = 3570^2 + 8083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78079789 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 (78079783) 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, 438562 + ... + 438739.

It is an arithmetic number, because the mean of its divisors is an integer number (19739295).

Almost surely, 2^78079789 is an apocalyptic number.

It is an amenable number.

78079789 is a deficient number, since it is larger than the sum of its proper divisors (877391).

78079789 is an equidigital number, since it uses as much as digits as its factorization.

78079789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 877390.

The product of its (nonzero) digits is 1778112, while the sum is 55.

The square root of 78079789 is about 8836.2768743402. The cubic root of 78079789 is about 427.4115070528.

The spelling of 78079789 in words is "seventy-eight million, seventy-nine thousand, seven hundred eighty-nine".