77448609 has 16 divisors (see below), whose sum is σ = 131130240. Its totient is φ = 44256240.

The previous prime is 77448607. The next prime is 77448619. The reversal of 77448609 is 90684477.

It is not a de Polignac number, because 77448609 - 2¹ = 77448607 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77448607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204702 + ... + 205079.

It is an arithmetic number, because the mean of its divisors is an integer number (8195640).

Almost surely, 2^77448609 is an apocalyptic number.

It is an amenable number.

77448609 is a deficient number, since it is larger than the sum of its proper divisors (53681631).

77448609 is a wasteful number, since it uses less digits than its factorization.

77448609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 409797 (or 409791 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 77448609 is about 8800.4891341334. The cubic root of 77448609 is about 426.2566891793.

The spelling of 77448609 in words is "seventy-seven million, four hundred forty-eight thousand, six hundred nine".