778613440 has 56 divisors (see below), whose sum is σ = 2022634512. Its totient is φ = 283130880.

The previous prime is 778613419. The next prime is 778613441. The reversal of 778613440 is 44316877.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 778613393 and 778613402.

It is not an unprimeable number, because it can be changed into a prime (778613441) 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, 107079 + ... + 114118.

Almost surely, 2^778613440 is an apocalyptic number.

It is an amenable number.

778613440 is an abundant number, since it is smaller than the sum of its proper divisors (1244021072).

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

778613440 is a wasteful number, since it uses less digits than its factorization.

778613440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221225 (or 221215 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 778613440 is about 27903.6456399518. The cubic root of 778613440 is about 919.9706354837.

The spelling of 778613440 in words is "seven hundred seventy-eight million, six hundred thirteen thousand, four hundred forty".