77985216 has 42 divisors (see below), whose sum is σ = 223532192. Its totient is φ = 25994880.

The previous prime is 77985209. The next prime is 77985227. The reversal of 77985216 is 61258977.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67120 + ... + 68271.

Almost surely, 2^77985216 is an apocalyptic number.

It is an amenable number.

77985216 is an abundant number, since it is smaller than the sum of its proper divisors (145546976).

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

77985216 is a wasteful number, since it uses less digits than its factorization.

77985216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135409 (or 135396 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 77985216 is about 8830.9238474805. The cubic root of 77985216 is about 427.2388720257.

The spelling of 77985216 in words is "seventy-seven million, nine hundred eighty-five thousand, two hundred sixteen".