99778272 has 96 divisors (see below), whose sum is σ = 300827520. Its totient is φ = 28638720.

The previous prime is 99778271. The next prime is 99778309. The reversal of 99778272 is 27287799.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99778271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17578 + ... + 22550.

It is an arithmetic number, because the mean of its divisors is an integer number (3133620).

Almost surely, 2^99778272 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 99778272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (150413760).

99778272 is an abundant number, since it is smaller than the sum of its proper divisors (201049248).

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

99778272 is a wasteful number, since it uses less digits than its factorization.

99778272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5016 (or 5008 counting only the distinct ones).

The product of its digits is 889056, while the sum is 51.

The square root of 99778272 is about 9988.9074477642. The cubic root of 99778272 is about 463.8155727612.

The spelling of 99778272 in words is "ninety-nine million, seven hundred seventy-eight thousand, two hundred seventy-two".