78424393854 has 16 divisors (see below), whose sum is σ = 160674368400. Its totient is φ = 25503867840.

The previous prime is 78424393823. The next prime is 78424393877. The reversal of 78424393854 is 45839342487.

It is a junction number, because it is equal to n+sod(n) for n = 78424393794 and 78424393803.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159398929 + ... + 159399420.

It is an arithmetic number, because the mean of its divisors is an integer number (10042148025).

Almost surely, 2^78424393854 is an apocalyptic number.

78424393854 is an abundant number, since it is smaller than the sum of its proper divisors (82249974546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78424393854 is a wasteful number, since it uses less digits than its factorization.

78424393854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318798395.

The product of its digits is 23224320, while the sum is 57.

The spelling of 78424393854 in words is "seventy-eight billion, four hundred twenty-four million, three hundred ninety-three thousand, eight hundred fifty-four".