778055680 has 52 divisors (see below), whose sum is σ = 1867154832. Its totient is φ = 311214080.

The previous prime is 778055623. The next prime is 778055683. The reversal of 778055680 is 86550877.

It is a self number, because there is not a number n which added to its sum of digits gives 778055680.

It is not an unprimeable number, because it can be changed into a prime (778055683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1485 + ... + 39475.

Almost surely, 2^778055680 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 778055680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (933577416).

778055680 is an abundant number, since it is smaller than the sum of its proper divisors (1089099152).

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

778055680 is an equidigital number, since it uses as much as digits as its factorization.

778055680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38020 (or 37998 counting only the distinct ones).

The product of its (nonzero) digits is 470400, while the sum is 46.

The square root of 778055680 is about 27893.6494564623. The cubic root of 778055680 is about 919.7509092501.

The spelling of 778055680 in words is "seven hundred seventy-eight million, fifty-five thousand, six hundred eighty".