77689389 has 4 divisors (see below), whose sum is σ = 103585856. Its totient is φ = 51792924.

The previous prime is 77689357. The next prime is 77689397. The reversal of 77689389 is 98398677.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 77689389 - 2⁵ = 77689357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77689399) 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, 12948229 + ... + 12948234.

It is an arithmetic number, because the mean of its divisors is an integer number (25896464).

Almost surely, 2^77689389 is an apocalyptic number.

It is an amenable number.

77689389 is a deficient number, since it is larger than the sum of its proper divisors (25896467).

77689389 is a wasteful number, since it uses less digits than its factorization.

77689389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25896466.

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

The square root of 77689389 is about 8814.1584396924. The cubic root of 77689389 is about 426.6979620464.

The spelling of 77689389 in words is "seventy-seven million, six hundred eighty-nine thousand, three hundred eighty-nine".