99897660 has 72 divisors (see below), whose sum is σ = 305310096. Its totient is φ = 26438400.

The previous prime is 99897641. The next prime is 99897667. The reversal of 99897660 is 6679899.

It is a junction number, because it is equal to n+sod(n) for n = 99897597 and 99897606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99897667) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22635 + ... + 26685.

It is an arithmetic number, because the mean of its divisors is an integer number (4240418).

Almost surely, 2^99897660 is an apocalyptic number.

99897660 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99897660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152655048).

99897660 is an abundant number, since it is smaller than the sum of its proper divisors (205412436).

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

99897660 is a wasteful number, since it uses less digits than its factorization.

99897660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4203 (or 4198 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 99897660 is about 9994.8816901452. The cubic root of 99897660 is about 464.0004892484. Note that the first 3 decimals are identical.

The spelling of 99897660 in words is "ninety-nine million, eight hundred ninety-seven thousand, six hundred sixty".