778085978 has 8 divisors (see below), whose sum is σ = 1168483968. Its totient is φ = 388591324.

The previous prime is 778085977. The next prime is 778086013. The reversal of 778085978 is 879580877.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (778085977) 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, 223676 + ... + 227127.

It is an arithmetic number, because the mean of its divisors is an integer number (146060496).

Almost surely, 2^778085978 is an apocalyptic number.

778085978 is a deficient number, since it is larger than the sum of its proper divisors (390397990).

778085978 is a wasteful number, since it uses less digits than its factorization.

778085978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451668.

The product of its (nonzero) digits is 7902720, while the sum is 59.

The square root of 778085978 is about 27894.1925497047. The cubic root of 778085978 is about 919.7628476637.

The spelling of 778085978 in words is "seven hundred seventy-eight million, eighty-five thousand, nine hundred seventy-eight".