77724286128 has 50 divisors (see below), whose sum is σ = 224956637444. Its totient is φ = 25908094944.

The previous prime is 77724286121. The next prime is 77724286141. The reversal of 77724286128 is 82168242777.

77724286128 is a `hidden beast` number, since 77 + 72 + 428 + 61 + 28 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (77724286121) 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 9 ways as a sum of consecutive naturals, for example, 29984926 + ... + 29987517.

Almost surely, 2^77724286128 is an apocalyptic number.

It is an amenable number.

77724286128 is an abundant number, since it is smaller than the sum of its proper divisors (147232351316).

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

77724286128 is a wasteful number, since it uses less digits than its factorization.

77724286128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59972463 (or 59972448 counting only the distinct ones).

The product of its digits is 4214784, while the sum is 54.

The spelling of 77724286128 in words is "seventy-seven billion, seven hundred twenty-four million, two hundred eighty-six thousand, one hundred twenty-eight".