99797880 has 384 divisors, whose sum is σ = 400550400. Its totient is φ = 19408896.

The previous prime is 99797869. The next prime is 99797881. The reversal of 99797880 is 8879799.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a self number, because there is not a number n which added to its sum of digits gives 99797880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99797881) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2697222 + ... + 2697258.

It is an arithmetic number, because the mean of its divisors is an integer number (1043100).

Almost surely, 2^99797880 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 99797880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (200275200).

99797880 is an abundant number, since it is smaller than the sum of its proper divisors (300752520).

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

99797880 is a wasteful number, since it uses less digits than its factorization.

99797880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 57.

The square root of 99797880 is about 9989.8888882710. Note that the first 6 decimals coincide. The cubic root of 99797880 is about 463.8459531233.

The spelling of 99797880 in words is "ninety-nine million, seven hundred ninety-seven thousand, eight hundred eighty".