7770520660 has 96 divisors (see below), whose sum is σ = 19005477120. Its totient is φ = 2613485568.

The previous prime is 7770520621. The next prime is 7770520679. The reversal of 7770520660 is 660250777.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 6384372 + ... + 6385588.

It is an arithmetic number, because the mean of its divisors is an integer number (197973720).

Almost surely, 2^7770520660 is an apocalyptic number.

7770520660 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 7770520660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9502738560).

7770520660 is an abundant number, since it is smaller than the sum of its proper divisors (11234956460).

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

7770520660 is a wasteful number, since it uses less digits than its factorization.

7770520660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2065 (or 2063 counting only the distinct ones).

The product of its (nonzero) digits is 123480, while the sum is 40.

The square root of 7770520660 is about 88150.5567764606. The cubic root of 7770520660 is about 1980.6909009494.

The spelling of 7770520660 in words is "seven billion, seven hundred seventy million, five hundred twenty thousand, six hundred sixty".