77814851860 has 12 divisors (see below), whose sum is σ = 163411188948. Its totient is φ = 31125940736.

The previous prime is 77814851857. The next prime is 77814851957. The reversal of 77814851860 is 6815841877.

It can be written as a sum of positive squares in 2 ways, for example, as 42430232196 + 35384619664 = 205986^2 + 188108^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1945371277 + ... + 1945371316.

It is an arithmetic number, because the mean of its divisors is an integer number (13617599079).

Almost surely, 2^77814851860 is an apocalyptic number.

It is an amenable number.

77814851860 is an abundant number, since it is smaller than the sum of its proper divisors (85596337088).

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

77814851860 is a wasteful number, since it uses less digits than its factorization.

77814851860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3890742602 (or 3890742600 counting only the distinct ones).

The product of its (nonzero) digits is 3010560, while the sum is 55.

The spelling of 77814851860 in words is "seventy-seven billion, eight hundred fourteen million, eight hundred fifty-one thousand, eight hundred sixty".