77009 has 4 divisors (see below), whose sum is σ = 78516. Its totient is φ = 75504.

The previous prime is 77003. The next prime is 77017. The reversal of 77009 is 90077.

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 67600 + 9409 = 260^2 + 97^2 .

It is a cyclic number.

It is not a de Polignac number, because 77009 - 2⁸ = 76753 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77003) 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, 674 + ... + 779.

It is an arithmetic number, because the mean of its divisors is an integer number (19629).

2⁷⁷⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

77009 is a deficient number, since it is larger than the sum of its proper divisors (1507).

77009 is a wasteful number, since it uses less digits than its factorization.

77009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1506.

The product of its (nonzero) digits is 441, while the sum is 23.

The square root of 77009 is about 277.5049549107. The cubic root of 77009 is about 42.5448661142.

The spelling of 77009 in words is "seventy-seven thousand, nine".