77128006 has 4 divisors (see below), whose sum is σ = 115692012. Its totient is φ = 38564002.

The previous prime is 77128003. The next prime is 77128021. The reversal of 77128006 is 60082177.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77128003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19282000 + ... + 19282003.

It is an arithmetic number, because the mean of its divisors is an integer number (28923003).

Almost surely, 2^77128006 is an apocalyptic number.

77128006 is a deficient number, since it is larger than the sum of its proper divisors (38564006).

77128006 is a wasteful number, since it uses less digits than its factorization.

77128006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38564005.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 77128006 is about 8782.2551773448. The cubic root of 77128006 is about 425.6677043050.

The spelling of 77128006 in words is "seventy-seven million, one hundred twenty-eight thousand, six".