77216689 has 8 divisors (see below), whose sum is σ = 85423680. Its totient is φ = 69207600.

The previous prime is 77216687. The next prime is 77216693. The reversal of 77216689 is 98661277.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 77216689 - 2¹ = 77216687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77216683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48654 + ... + 50215.

It is an arithmetic number, because the mean of its divisors is an integer number (10677960).

Almost surely, 2^77216689 is an apocalyptic number.

It is an amenable number.

77216689 is a deficient number, since it is larger than the sum of its proper divisors (8206991).

77216689 is a wasteful number, since it uses less digits than its factorization.

77216689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98951.

The product of its digits is 254016, while the sum is 46.

The square root of 77216689 is about 8787.3027147129. The cubic root of 77216689 is about 425.8307882996.

The spelling of 77216689 in words is "seventy-seven million, two hundred sixteen thousand, six hundred eighty-nine".