77128330 has 8 divisors (see below), whose sum is σ = 138831012. Its totient is φ = 30851328.

The previous prime is 77128321. The next prime is 77128333. The reversal of 77128330 is 3382177.

It can be written as a sum of positive squares in 2 ways, for example, as 76265289 + 863041 = 8733^2 + 929^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 77128292 and 77128301.

It is not an unprimeable number, because it can be changed into a prime (77128333) 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 in 3 ways as a sum of consecutive naturals, for example, 3856407 + ... + 3856426.

Almost surely, 2^77128330 is an apocalyptic number.

77128330 is a deficient number, since it is larger than the sum of its proper divisors (61702682).

77128330 is a wasteful number, since it uses less digits than its factorization.

77128330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7712840.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 77128330 is about 8782.2736236125. The cubic root of 77128330 is about 425.6683003537.

The spelling of 77128330 in words is "seventy-seven million, one hundred twenty-eight thousand, three hundred thirty".