77805268 has 6 divisors (see below), whose sum is σ = 136159226. Its totient is φ = 38902632.

The previous prime is 77805263. The next prime is 77805293. The reversal of 77805268 is 86250877.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 54937744 + 22867524 = 7412^2 + 4782^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77805263) 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 as a sum of consecutive naturals, namely, 9725655 + ... + 9725662.

Almost surely, 2^77805268 is an apocalyptic number.

It is an amenable number.

77805268 is a deficient number, since it is larger than the sum of its proper divisors (58353958).

77805268 is a wasteful number, since it uses less digits than its factorization.

77805268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19451321 (or 19451319 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 77805268 is about 8820.7294482939. The cubic root of 77805268 is about 426.9100063184.

The spelling of 77805268 in words is "seventy-seven million, eight hundred five thousand, two hundred sixty-eight".