77804065 has 4 divisors (see below), whose sum is σ = 93364884. Its totient is φ = 62243248.

The previous prime is 77804063. The next prime is 77804119. The reversal of 77804065 is 56040877.

It is a happy number.

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 13017664 + 64786401 = 3608^2 + 8049^2 .

It is a cyclic number.

It is not a de Polignac number, because 77804065 - 2¹ = 77804063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77804063) 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, 7780402 + ... + 7780411.

It is an arithmetic number, because the mean of its divisors is an integer number (23341221).

Almost surely, 2^77804065 is an apocalyptic number.

It is an amenable number.

77804065 is a deficient number, since it is larger than the sum of its proper divisors (15560819).

77804065 is a wasteful number, since it uses less digits than its factorization.

77804065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15560818.

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 77804065 is about 8820.6612563912. The cubic root of 77804065 is about 426.9078060587.

The spelling of 77804065 in words is "seventy-seven million, eight hundred four thousand, sixty-five".