778187142 has 64 divisors (see below), whose sum is σ = 1832294400. Its totient is φ = 244127520.

The previous prime is 778187119. The next prime is 778187143. The reversal of 778187142 is 241781877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778187143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158667 + ... + 163497.

It is an arithmetic number, because the mean of its divisors is an integer number (28629600).

Almost surely, 2^778187142 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778187142, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (916147200).

778187142 is an abundant number, since it is smaller than the sum of its proper divisors (1054107258).

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

778187142 is a wasteful number, since it uses less digits than its factorization.

778187142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5018 (or 5012 counting only the distinct ones).

The product of its digits is 175616, while the sum is 45.

The square root of 778187142 is about 27896.0058431310. The cubic root of 778187142 is about 919.8027073789.

The spelling of 778187142 in words is "seven hundred seventy-eight million, one hundred eighty-seven thousand, one hundred forty-two".