780986660 has 24 divisors (see below), whose sum is σ = 1666961016. Its totient is φ = 307272960.

The previous prime is 780986611. The next prime is 780986677. The reversal of 780986660 is 66689087.

It can be written as a sum of positive squares in 4 ways, for example, as 7744 + 780978916 = 88^2 + 27946^2 .

It is a super-3 number, since 3×780986660³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 780986599 and 780986608.

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, 318857 + ... + 321296.

It is an arithmetic number, because the mean of its divisors is an integer number (69456709).

Almost surely, 2^780986660 is an apocalyptic number.

It is an amenable number.

780986660 is an abundant number, since it is smaller than the sum of its proper divisors (885974356).

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

780986660 is a wasteful number, since it uses less digits than its factorization.

780986660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640223 (or 640221 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 780986660 is about 27946.1385525800. The cubic root of 780986660 is about 920.9043800596.

The spelling of 780986660 in words is "seven hundred eighty million, nine hundred eighty-six thousand, six hundred sixty".