77129599220 has 12 divisors (see below), whose sum is σ = 161972158404. Its totient is φ = 30851839680.

The previous prime is 77129599219. The next prime is 77129599223. The reversal of 77129599220 is 2299592177.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10088997136 + 67040602084 = 100444^2 + 258922^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77129599223) 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 3 ways as a sum of consecutive naturals, for example, 1928239961 + ... + 1928240000.

It is an arithmetic number, because the mean of its divisors is an integer number (13497679867).

Almost surely, 2^77129599220 is an apocalyptic number.

It is an amenable number.

77129599220 is an abundant number, since it is smaller than the sum of its proper divisors (84842559184).

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

77129599220 is a wasteful number, since it uses less digits than its factorization.

77129599220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3856479970 (or 3856479968 counting only the distinct ones).

The product of its (nonzero) digits is 1428840, while the sum is 53.

The spelling of 77129599220 in words is "seventy-seven billion, one hundred twenty-nine million, five hundred ninety-nine thousand, two hundred twenty".