778945134 has 64 divisors (see below), whose sum is σ = 1833580800. Its totient is φ = 217950720.

The previous prime is 778945093. The next prime is 778945157. The reversal of 778945134 is 431549877.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 52917 + ... + 66015.

It is an arithmetic number, because the mean of its divisors is an integer number (28649700).

Almost surely, 2^778945134 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778945134, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (916790400).

778945134 is an abundant number, since it is smaller than the sum of its proper divisors (1054635666).

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

778945134 is a wasteful number, since it uses less digits than its factorization.

778945134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13185.

The product of its digits is 846720, while the sum is 48.

The square root of 778945134 is about 27909.5885673723. The cubic root of 778945134 is about 920.1012546086.

It can be divided in two parts, 77894 and 5134, that added together give a triangular number (83028 = T₄₀₇).

The spelling of 778945134 in words is "seven hundred seventy-eight million, nine hundred forty-five thousand, one hundred thirty-four".