77933489 has 4 divisors (see below), whose sum is σ = 77963124. Its totient is φ = 77903856.

The previous prime is 77933477. The next prime is 77933521. The reversal of 77933489 is 98433977.

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 55056400 + 22877089 = 7420^2 + 4783^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77933489 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 (77933419) 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 in 3 ways as a sum of consecutive naturals, for example, 10442 + ... + 16275.

It is an arithmetic number, because the mean of its divisors is an integer number (19490781).

Almost surely, 2^77933489 is an apocalyptic number.

It is an amenable number.

77933489 is a deficient number, since it is larger than the sum of its proper divisors (29635).

77933489 is a wasteful number, since it uses less digits than its factorization.

77933489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29634.

The product of its digits is 1143072, while the sum is 50.

The square root of 77933489 is about 8827.9946193912. The cubic root of 77933489 is about 427.1443897025.

The spelling of 77933489 in words is "seventy-seven million, nine hundred thirty-three thousand, four hundred eighty-nine".