77128193772 has 72 divisors (see below), whose sum is σ = 224859034400. Its totient is φ = 21834448128.

The previous prime is 77128193743. The next prime is 77128193773. The reversal of 77128193772 is 27739182177.

It is not an unprimeable number, because it can be changed into a prime (77128193773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1376497 + ... + 1431432.

Almost surely, 2^77128193772 is an apocalyptic number.

It is an amenable number.

77128193772 is an abundant number, since it is smaller than the sum of its proper divisors (147730840628).

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

77128193772 is a wasteful number, since it uses less digits than its factorization.

77128193772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2808055 (or 2808050 counting only the distinct ones).

The product of its digits is 2074464, while the sum is 54.

The spelling of 77128193772 in words is "seventy-seven billion, one hundred twenty-eight million, one hundred ninety-three thousand, seven hundred seventy-two".