778750640 has 40 divisors (see below), whose sum is σ = 1852710288. Its totient is φ = 304254720.

The previous prime is 778750633. The next prime is 778750657. The reversal of 778750640 is 46057877.

778750640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 778750591 and 778750600.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109751 + ... + 116630.

Almost surely, 2^778750640 is an apocalyptic number.

It is an amenable number.

778750640 is an abundant number, since it is smaller than the sum of its proper divisors (1073959648).

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

778750640 is a wasteful number, since it uses less digits than its factorization.

778750640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226437 (or 226431 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 44.

The square root of 778750640 is about 27906.1039917793. The cubic root of 778750640 is about 920.0246685257.

The spelling of 778750640 in words is "seven hundred seventy-eight million, seven hundred fifty thousand, six hundred forty".