77689938 has 16 divisors (see below), whose sum is σ = 156250080. Its totient is φ = 25751616.

The previous prime is 77689897. The next prime is 77689939. The reversal of 77689938 is 83998677.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (77689939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35095 + ... + 37242.

It is an arithmetic number, because the mean of its divisors is an integer number (9765630).

Almost surely, 2^77689938 is an apocalyptic number.

77689938 is an abundant number, since it is smaller than the sum of its proper divisors (78560142).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77689938 is a wasteful number, since it uses less digits than its factorization.

77689938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72521.

The product of its digits is 4572288, while the sum is 57.

The square root of 77689938 is about 8814.1895827126. The cubic root of 77689938 is about 426.6989671456.

The spelling of 77689938 in words is "seventy-seven million, six hundred eighty-nine thousand, nine hundred thirty-eight".