78831728407 has 8 divisors (see below), whose sum is σ = 79715081600. Its totient is φ = 77949817344.

The previous prime is 78831728401. The next prime is 78831728431. The reversal of 78831728407 is 70482713887.

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 78831728407 - 2²⁷ = 78697510679 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 (78831728401) 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, 250407 + ... + 469432.

It is an arithmetic number, because the mean of its divisors is an integer number (9964385200).

Almost surely, 2^78831728407 is an apocalyptic number.

78831728407 is a deficient number, since it is larger than the sum of its proper divisors (883353193).

78831728407 is a wasteful number, since it uses less digits than its factorization.

78831728407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721065.

The product of its (nonzero) digits is 4214784, while the sum is 55.

The spelling of 78831728407 in words is "seventy-eight billion, eight hundred thirty-one million, seven hundred twenty-eight thousand, four hundred seven".