77065509 has 8 divisors (see below), whose sum is σ = 104438752. Its totient is φ = 50534640.

The previous prime is 77065493. The next prime is 77065517. The reversal of 77065509 is 90556077.

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

It is not a de Polignac number, because 77065509 - 2⁴ = 77065493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77065559) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 210379 + ... + 210744.

It is an arithmetic number, because the mean of its divisors is an integer number (13054844).

Almost surely, 2^77065509 is an apocalyptic number.

It is an amenable number.

77065509 is a deficient number, since it is larger than the sum of its proper divisors (27373243).

77065509 is a wasteful number, since it uses less digits than its factorization.

77065509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421187.

The product of its (nonzero) digits is 66150, while the sum is 39.

The square root of 77065509 is about 8778.6963155129. The cubic root of 77065509 is about 425.5527000646.

The spelling of 77065509 in words is "seventy-seven million, sixty-five thousand, five hundred nine".