77528565 has 12 divisors (see below), whose sum is σ = 134382924. Its totient is φ = 41348544.

The previous prime is 77528519. The next prime is 77528567. The reversal of 77528565 is 56582577.

77528565 is a `hidden beast` number, since 77 + 528 + 56 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 29877156 + 47651409 = 5466^2 + 6903^2 .

It is not a de Polignac number, because 77528565 - 2⁹ = 77528053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1722857 = 77528565 / (7 + 7 + 5 + 2 + 8 + 5 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 77528565.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77528567) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 861384 + ... + 861473.

It is an arithmetic number, because the mean of its divisors is an integer number (11198577).

Almost surely, 2^77528565 is an apocalyptic number.

It is an amenable number.

77528565 is a deficient number, since it is larger than the sum of its proper divisors (56854359).

77528565 is a wasteful number, since it uses less digits than its factorization.

77528565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722868 (or 1722865 counting only the distinct ones).

The product of its digits is 588000, while the sum is 45.

The square root of 77528565 is about 8805.0306643418. The cubic root of 77528565 is about 426.4033242991.

The spelling of 77528565 in words is "seventy-seven million, five hundred twenty-eight thousand, five hundred sixty-five".