77907009 has 4 divisors (see below), whose sum is σ = 103876016. Its totient is φ = 51938004.

The previous prime is 77907001. The next prime is 77907017. The reversal of 77907009 is 90070977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (77907001) and next prime (77907017).

It is not a de Polignac number, because 77907009 - 2³ = 77907001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77907001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12984499 + ... + 12984504.

It is an arithmetic number, because the mean of its divisors is an integer number (25969004).

Almost surely, 2^77907009 is an apocalyptic number.

It is an amenable number.

77907009 is a deficient number, since it is larger than the sum of its proper divisors (25969007).

77907009 is a wasteful number, since it uses less digits than its factorization.

77907009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25969006.

The product of its (nonzero) digits is 27783, while the sum is 39.

The square root of 77907009 is about 8826.4947176102. The cubic root of 77907009 is about 427.0960062888.

The spelling of 77907009 in words is "seventy-seven million, nine hundred seven thousand, nine".