778088660 has 12 divisors (see below), whose sum is σ = 1633986228. Its totient is φ = 311235456.

The previous prime is 778088653. The next prime is 778088671. The reversal of 778088660 is 66880877.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 537590596 + 240498064 = 23186^2 + 15508^2 .

It is a junction number, because it is equal to n+sod(n) for n = 778088599 and 778088608.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 19452197 + ... + 19452236.

It is an arithmetic number, because the mean of its divisors is an integer number (136165519).

Almost surely, 2^778088660 is an apocalyptic number.

It is an amenable number.

778088660 is an abundant number, since it is smaller than the sum of its proper divisors (855897568).

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

778088660 is a wasteful number, since it uses less digits than its factorization.

778088660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38904442 (or 38904440 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 50.

The square root of 778088660 is about 27894.2406241862. The cubic root of 778088660 is about 919.7639044454.

It can be divided in two parts, 77808 and 8660, that added together give a palindrome (86468).

The spelling of 778088660 in words is "seven hundred seventy-eight million, eighty-eight thousand, six hundred sixty".