766670660 has 72 divisors (see below), whose sum is σ = 1878035544. Its totient is φ = 262133760.

The previous prime is 766670629. The next prime is 766670677. The reversal of 766670660 is 66076667.

It can be written as a sum of positive squares in 4 ways, for example, as 192876544 + 573794116 = 13888^2 + 23954^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 450932 + ... + 452628.

It is an arithmetic number, because the mean of its divisors is an integer number (26083827).

Almost surely, 2^766670660 is an apocalyptic number.

766670660 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 766670660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (939017772).

766670660 is an abundant number, since it is smaller than the sum of its proper divisors (1111364884).

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

766670660 is a wasteful number, since it uses less digits than its factorization.

766670660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2181 (or 2172 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 44.

The square root of 766670660 is about 27688.8183207590. The cubic root of 766670660 is about 915.2427158271.

The spelling of 766670660 in words is "seven hundred sixty-six million, six hundred seventy thousand, six hundred sixty".