77680789 has 4 divisors (see below), whose sum is σ = 77709600. Its totient is φ = 77651980.

The previous prime is 77680783. The next prime is 77680793. The reversal of 77680789 is 98708677.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98708677 = 107 ⋅922511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77680789 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 (77680783) 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, 9889 + ... + 15910.

It is an arithmetic number, because the mean of its divisors is an integer number (19427400).

Almost surely, 2^77680789 is an apocalyptic number.

It is an amenable number.

77680789 is a deficient number, since it is larger than the sum of its proper divisors (28811).

77680789 is a wasteful number, since it uses less digits than its factorization.

77680789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28810.

The product of its (nonzero) digits is 1185408, while the sum is 52.

The square root of 77680789 is about 8813.6705747379. The cubic root of 77680789 is about 426.6822167049.

The spelling of 77680789 in words is "seventy-seven million, six hundred eighty thousand, seven hundred eighty-nine".