77216850 has 144 divisors (see below), whose sum is σ = 220376520. Its totient is φ = 19353600.

The previous prime is 77216801. The next prime is 77216861. The reversal of 77216850 is 5861277.

It can be written as a sum of positive squares in 12 ways, for example, as 321489 + 76895361 = 567^2 + 8769^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 796002 + ... + 796098.

Almost surely, 2^77216850 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77216850, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110188260).

77216850 is an abundant number, since it is smaller than the sum of its proper divisors (143159670).

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

77216850 is a wasteful number, since it uses less digits than its factorization.

77216850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205 (or 197 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 36.

The square root of 77216850 is about 8787.3118756534. The cubic root of 77216850 is about 425.8310842577.

The spelling of 77216850 in words is "seventy-seven million, two hundred sixteen thousand, eight hundred fifty".