77565216 has 48 divisors (see below), whose sum is σ = 204307488. Its totient is φ = 25766400.

The previous prime is 77565179. The next prime is 77565233. The reversal of 77565216 is 61256577.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30556 + ... + 32996.

It is an arithmetic number, because the mean of its divisors is an integer number (4256406).

Almost surely, 2^77565216 is an apocalyptic number.

It is an amenable number.

77565216 is an abundant number, since it is smaller than the sum of its proper divisors (126742272).

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

77565216 is a wasteful number, since it uses less digits than its factorization.

77565216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2785 (or 2777 counting only the distinct ones).

The product of its digits is 88200, while the sum is 39.

The square root of 77565216 is about 8807.1116718252. Note that the first 3 decimals coincide. The cubic root of 77565216 is about 426.4705066174.

The spelling of 77565216 in words is "seventy-seven million, five hundred sixty-five thousand, two hundred sixteen".