77187127880 has 16 divisors (see below), whose sum is σ = 173671037820. Its totient is φ = 30874851136.

The previous prime is 77187127841. The next prime is 77187127903. The reversal of 77187127880 is 8872178177.

It can be written as a sum of positive squares in 2 ways, for example, as 76062330436 + 1124797444 = 275794^2 + 33538^2 .

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 3 ways as a sum of consecutive naturals, for example, 964839059 + ... + 964839138.

Almost surely, 2^77187127880 is an apocalyptic number.

It is an amenable number.

77187127880 is an abundant number, since it is smaller than the sum of its proper divisors (96483909940).

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

77187127880 is a wasteful number, since it uses less digits than its factorization.

77187127880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1929678208 (or 1929678204 counting only the distinct ones).

The product of its (nonzero) digits is 2458624, while the sum is 56.

The spelling of 77187127880 in words is "seventy-seven billion, one hundred eighty-seven million, one hundred twenty-seven thousand, eight hundred eighty".