77684216 has 8 divisors (see below), whose sum is σ = 145657920. Its totient is φ = 38842104.

The previous prime is 77684213. The next prime is 77684221. The reversal of 77684216 is 61248677.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77684213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4855256 + ... + 4855271.

It is an arithmetic number, because the mean of its divisors is an integer number (18207240).

Almost surely, 2^77684216 is an apocalyptic number.

It is an amenable number.

77684216 is a deficient number, since it is larger than the sum of its proper divisors (67973704).

77684216 is a wasteful number, since it uses less digits than its factorization.

77684216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9710533 (or 9710529 counting only the distinct ones).

The product of its digits is 112896, while the sum is 41.

The square root of 77684216 is about 8813.8649864858. The cubic root of 77684216 is about 426.6884911796.

The spelling of 77684216 in words is "seventy-seven million, six hundred eighty-four thousand, two hundred sixteen".