780378440 has 32 divisors (see below), whose sum is σ = 1759347000. Its totient is φ = 311529984.

The previous prime is 780378439. The next prime is 780378449. The reversal of 780378440 is 44873087.

It can be written as a sum of positive squares in 4 ways, for example, as 709583044 + 70795396 = 26638^2 + 8414^2 .

It is not an unprimeable number, because it can be changed into a prime (780378449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1196 + ... + 39524.

Almost surely, 2^780378440 is an apocalyptic number.

It is an amenable number.

780378440 is an abundant number, since it is smaller than the sum of its proper divisors (978968560).

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

780378440 is a wasteful number, since it uses less digits than its factorization.

780378440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38849 (or 38845 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 780378440 is about 27935.2544287680. The cubic root of 780378440 is about 920.6652560745.

The spelling of 780378440 in words is "seven hundred eighty million, three hundred seventy-eight thousand, four hundred forty".