778738944 has 72 divisors (see below), whose sum is σ = 2120870752. Its totient is φ = 253532160.

The previous prime is 778738937. The next prime is 778738949. The reversal of 778738944 is 449837877.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778738949) 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 7 ways as a sum of consecutive naturals, for example, 21234 + ... + 44814.

Almost surely, 2^778738944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 778738944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1060435376).

778738944 is an abundant number, since it is smaller than the sum of its proper divisors (1342131808).

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

778738944 is a wasteful number, since it uses less digits than its factorization.

778738944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23643 (or 23629 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 57.

The square root of 778738944 is about 27905.8944311054. The cubic root of 778738944 is about 920.0200625745.

The spelling of 778738944 in words is "seven hundred seventy-eight million, seven hundred thirty-eight thousand, nine hundred forty-four".