99771912 has 96 divisors (see below), whose sum is σ = 296805600. Its totient is φ = 31290624.

The previous prime is 99771863. The next prime is 99771949. The reversal of 99771912 is 21917799.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31539 + ... + 34557.

It is an arithmetic number, because the mean of its divisors is an integer number (3091725).

Almost surely, 2^99771912 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 99771912, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148402800).

99771912 is an abundant number, since it is smaller than the sum of its proper divisors (197033688).

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

99771912 is a wasteful number, since it uses less digits than its factorization.

99771912 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3057 (or 3041 counting only the distinct ones).

The product of its digits is 71442, while the sum is 45.

The square root of 99771912 is about 9988.5890895561. The cubic root of 99771912 is about 463.8057178110.

The spelling of 99771912 in words is "ninety-nine million, seven hundred seventy-one thousand, nine hundred twelve".