77128528 has 10 divisors (see below), whose sum is σ = 149436554. Its totient is φ = 38564256.

The previous prime is 77128523. The next prime is 77128529. The reversal of 77128528 is 82582177.

It can be written as a sum of positive squares in only one way, i.e., 69355584 + 7772944 = 8328^2 + 2788^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77128523) 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, 2410251 + ... + 2410282.

Almost surely, 2^77128528 is an apocalyptic number.

It is an amenable number.

77128528 is a deficient number, since it is larger than the sum of its proper divisors (72308026).

77128528 is a wasteful number, since it uses less digits than its factorization.

77128528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4820541 (or 4820535 counting only the distinct ones).

The product of its digits is 62720, while the sum is 40.

The square root of 77128528 is about 8782.2848963126. The cubic root of 77128528 is about 425.6686646049.

The spelling of 77128528 in words is "seventy-seven million, one hundred twenty-eight thousand, five hundred twenty-eight".