77128068 has 48 divisors (see below), whose sum is σ = 193867520. Its totient is φ = 23786784.

The previous prime is 77128067. The next prime is 77128069. The reversal of 77128068 is 86082177.

It is an interprime number because it is at equal distance from previous prime (77128067) and next prime (77128069).

It is not an unprimeable number, because it can be changed into a prime (77128067) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5871 + ... + 13737.

Almost surely, 2^77128068 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77128068, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96933760).

77128068 is an abundant number, since it is smaller than the sum of its proper divisors (116739452).

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

77128068 is a wasteful number, since it uses less digits than its factorization.

77128068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7936 (or 7934 counting only the distinct ones).

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 77128068 is about 8782.2587071892. The cubic root of 77128068 is about 425.6678183639.

The spelling of 77128068 in words is "seventy-seven million, one hundred twenty-eight thousand, sixty-eight".