771001660 has 144 divisors (see below), whose sum is σ = 1942405920. Its totient is φ = 254791680.

The previous prime is 771001591. The next prime is 771001669. The reversal of 771001660 is 66100177.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771001669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3308904 + ... + 3309136.

It is an arithmetic number, because the mean of its divisors is an integer number (13488930).

Almost surely, 2^771001660 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 771001660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (971202960).

771001660 is an abundant number, since it is smaller than the sum of its proper divisors (1171404260).

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

771001660 is a wasteful number, since it uses less digits than its factorization.

771001660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 771001660 is about 27766.9166455334. The cubic root of 771001660 is about 916.9629135420.

The spelling of 771001660 in words is "seven hundred seventy-one million, one thousand, six hundred sixty".