77650145 has 4 divisors (see below), whose sum is σ = 93180180. Its totient is φ = 62120112.

The previous prime is 77650129. The next prime is 77650171. The reversal of 77650145 is 54105677.

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

It can be written as a sum of positive squares in 2 ways, for example, as 33547264 + 44102881 = 5792^2 + 6641^2 .

It is a cyclic number.

It is not a de Polignac number, because 77650145 - 2⁴ = 77650129 is a prime.

It is an unprimeable number.

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, 7765010 + ... + 7765019.

It is an arithmetic number, because the mean of its divisors is an integer number (23295045).

Almost surely, 2^77650145 is an apocalyptic number.

It is an amenable number.

77650145 is a deficient number, since it is larger than the sum of its proper divisors (15530035).

77650145 is a wasteful number, since it uses less digits than its factorization.

77650145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15530034.

The product of its (nonzero) digits is 29400, while the sum is 35.

The square root of 77650145 is about 8811.9319675086. The cubic root of 77650145 is about 426.6261025754.

The spelling of 77650145 in words is "seventy-seven million, six hundred fifty thousand, one hundred forty-five".