78479724949 has 4 divisors (see below), whose sum is σ = 78480313164. Its totient is φ = 78479136736.

The previous prime is 78479724901. The next prime is 78479724959. The reversal of 78479724949 is 94942797487.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 94942797487 = 47 ⋅2020059521.

It can be written as a sum of positive squares in 2 ways, for example, as 44555610724 + 33924114225 = 211082^2 + 184185^2 .

It is a cyclic number.

It is not a de Polignac number, because 78479724949 - 2⁷ = 78479724821 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 (78479724959) 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, 12729 + ... + 396385.

It is an arithmetic number, because the mean of its divisors is an integer number (19620078291).

Almost surely, 2^78479724949 is an apocalyptic number.

It is an amenable number.

78479724949 is a deficient number, since it is larger than the sum of its proper divisors (588215).

78479724949 is a wasteful number, since it uses less digits than its factorization.

78479724949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588214.

The product of its digits is 256048128, while the sum is 70.

The spelling of 78479724949 in words is "seventy-eight billion, four hundred seventy-nine million, seven hundred twenty-four thousand, nine hundred forty-nine".