99771312 has 80 divisors (see below), whose sum is σ = 264983040. Its totient is φ = 32338176.

The previous prime is 99771307. The next prime is 99771359. The reversal of 99771312 is 21317799.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314578 + ... + 314894.

It is an arithmetic number, because the mean of its divisors is an integer number (3312288).

Almost surely, 2^99771312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99771312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132491520).

99771312 is an abundant number, since it is smaller than the sum of its proper divisors (165211728).

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

99771312 is a wasteful number, since it uses less digits than its factorization.

99771312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 484 counting only the distinct ones).

The product of its digits is 23814, while the sum is 39.

The square root of 99771312 is about 9988.5590552391. The cubic root of 99771312 is about 463.8047880771.

The spelling of 99771312 in words is "ninety-nine million, seven hundred seventy-one thousand, three hundred twelve".