79784128909 has 8 divisors (see below), whose sum is σ = 80034484608. Its totient is φ = 79533854400.

The previous prime is 79784128903. The next prime is 79784128967. The reversal of 79784128909 is 90982148797.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79784128909 - 2⁵ = 79784128877 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 (79784128903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2393334 + ... + 2426440.

It is an arithmetic number, because the mean of its divisors is an integer number (10004310576).

Almost surely, 2^79784128909 is an apocalyptic number.

It is an amenable number.

79784128909 is a deficient number, since it is larger than the sum of its proper divisors (250355699).

79784128909 is a wasteful number, since it uses less digits than its factorization.

79784128909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40595.

The product of its (nonzero) digits is 18289152, while the sum is 64.

The spelling of 79784128909 in words is "seventy-nine billion, seven hundred eighty-four million, one hundred twenty-eight thousand, nine hundred nine".