77128178480 has 20 divisors (see below), whose sum is σ = 179323015152. Its totient is φ = 30851271360.

The previous prime is 77128178471. The next prime is 77128178513. The reversal of 77128178480 is 8487182177.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×77128178480² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 482051036 + ... + 482051195.

Almost surely, 2^77128178480 is an apocalyptic number.

It is an amenable number.

77128178480 is an abundant number, since it is smaller than the sum of its proper divisors (102194836672).

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

77128178480 is a wasteful number, since it uses less digits than its factorization.

77128178480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964102244 (or 964102238 counting only the distinct ones).

The product of its (nonzero) digits is 1404928, while the sum is 53.

The spelling of 77128178480 in words is "seventy-seven billion, one hundred twenty-eight million, one hundred seventy-eight thousand, four hundred eighty".