78424950385 has 12 divisors (see below), whose sum is σ = 95891173812. Its totient is φ = 61552609248.

The previous prime is 78424950367. The next prime is 78424950391. The reversal of 78424950385 is 58305942487.

It can be written as a sum of positive squares in 2 ways, for example, as 42615822096 + 35809128289 = 206436^2 + 189233^2 .

It is not a de Polignac number, because 78424950385 - 2⁵ = 78424950353 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4550194 + ... + 4567396.

It is an arithmetic number, because the mean of its divisors is an integer number (7990931151).

Almost surely, 2^78424950385 is an apocalyptic number.

It is an amenable number.

78424950385 is a deficient number, since it is larger than the sum of its proper divisors (17466223427).

78424950385 is an frugal number, since it uses more digits than its factorization.

78424950385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34464 (or 17261 counting only the distinct ones).

The product of its (nonzero) digits is 9676800, while the sum is 55.

The spelling of 78424950385 in words is "seventy-eight billion, four hundred twenty-four million, nine hundred fifty thousand, three hundred eighty-five".