78424135890 has 16 divisors (see below), whose sum is σ = 188217926208. Its totient is φ = 20913102896.

The previous prime is 78424135883. The next prime is 78424135913. The reversal of 78424135890 is 9853142487.

It is a happy number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1307068902 + ... + 1307068961.

It is an arithmetic number, because the mean of its divisors is an integer number (11763620388).

Almost surely, 2^78424135890 is an apocalyptic number.

78424135890 is an abundant number, since it is smaller than the sum of its proper divisors (109793790318).

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

78424135890 is a wasteful number, since it uses less digits than its factorization.

78424135890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2614137873.

The product of its (nonzero) digits is 1935360, while the sum is 51.

The spelling of 78424135890 in words is "seventy-eight billion, four hundred twenty-four million, one hundred thirty-five thousand, eight hundred ninety".